FAQ

Frequently asked questions on W&H products and helpful descriptions on the topic of hygiene and care.

Sterilizers

  • Lara (29)
    • Do I need to carry out periodic testing on my Lisa/Lina/Lara/Lyla?
      Lisa/Lina/Lara/Lyla features test cycles (B&D/Helix test, Vacuum test). Compulsory and frequency of testing are regulated by local/national guidelines.
    • What is validation?
      Validation is a testing procedure carried out by an official authority, proving the effectiveness of your sterilizer. Compulsories and frequency of validation are regulated by local/national guidelines.
    • What periodic tests do I need to carry out on my Lisa/Lina/Lara sterilizer?
      Country/regional specific laws and guidelines referring to periodical testing or routine monitoring are individual and must be considered. Our recommendation for periodical testing is mentioned in the delivered IFU and depends on the integrated features in your sterilizer.
    • Do I need to document the results of all periodic tests?
      W&H recommends recording all periodic tests, repairs and modifications on the sterilizer in a logbook including date and signature of the person who carried out the test or other activity. Compulsories of recording is regulated by local/national guidelines.
    • How long should I archive the documentation of regular tests?
      Keep the results according to your country/regional specific laws and guidelines. Those records can be of assistance in case of service as well.
    • Does my sterilizer need any periodic qualification/validation?
      Validation generally comprises a range of tests defined in internationally recognised standards. These tests begin for every device with the factory tests at W&H. In addition, corresponding documentation is included with your device. Prior to commissioning the device at your premises, the technician performs further checks to ensure the device functions correctly. Then, depending on the national/regional laws and directives, the device must be subjected to a so-called renewed performance qualification at regular intervals. For further information, please contact your dealer.
    • Whom should I contact to validate and maintain my sterilizer?
      Validation shall be carried out by an official authority. Maintenance tasks shall be carried out by a qualified and authorised technician.
    • How do I change consumable components on my sterilizer?
      Consumable replacement instructions are provided in the Instructions for Use, chapter “Maintenance”. In addition, a video description is available: • in the sterilizer, in the maintenance section of the menu (only for Lisa); • in the Consumables & Accessories and Video Tutorial section of this web site.
    • How do I clean the water tanks and what products should I use?
      Water tank cleaning instructions are provided in the Instructions for Use, chapter “Maintenance”. Information and videos relating to the cleaning of the water tanks and cleaning products can also be found on the Video Tutorial section of this web site.
    • Which water quality should I use for my sterilizer?
      The water quality for sterilizers is internationally specified by standards and directives. The reasons for this are that your sterilizer can be seriously damaged by it or the sterilization can be jeopardized. Consequently, only water with conductivity of less than 15 µS/cm should be used for your W&H sterilizer. The Multidem system is especially suited to preparing suitable water (see chapter “Water quality” in the Instructions for Use).
    • Should I pouch/wrap my instruments and how long can I store them after sterilization?
      To ensure that your instruments are stored in a sterile state from their successful sterilization until they are used, W&H recommends wrapping them in suitable sterile barrier systems before sterilization. The recommended storage period can be found in the recommendations of the wrapping material manufacturer. For further information, please contact your dealer.
    • The sterilizer remains switched OFF.
      POSSIBLE CAUSE
      The main switch or network circuit breaker is OFF.
      SOLUTION
      Activate the main switch or network circuit breaker (ON).

      POSSIBLE CAUSE
      No voltage at the socket.
      SOLUTION
      Check the building electrical supply.

      POSSIBLE CAUSE
      The power cord is not connected properly.
      SOLUTION
      Check and connect the power cord properly.
    • Water is leaking at the front of the sterilizer.
      POSSIBLE CAUSE
      Leaks through the chamber door seal.
      SOLUTION
      Clean or replace the door seal. Clean the door surface facing the chamber.

      POSSIBLE CAUSE
      Internal leak.
      SOLUTION
      Contact an authorized W&H service partner.
    • The cycle starts but there is no rise in pressure/temperature.
      POSSIBLE CAUSE
      The safety thermostat is open.
      SOLUTION
      Reset the safety thermostat (see chapter “Reset the safety thermostat” in the Instructions for Use).

      POSSIBLE CAUSE
      Electric/electronic fault
      SOLUTION
      Contact an authorized W&H service partner.
    • At the end of the cycle, there is residual water in the chamber.
      POSSIBLE CAUSE
      Sterilizer not properly levelled.
      SOLUTION
      Place the sterilizator on a flat, level surface.

      POSSIBLE CAUSE
      Overloaded chamber.
      SOLUTION
      Comply with the maximum load weight limits for each type of load. Always use the chamber rack for trays and cassettes.

      POSSIBLE CAUSE
      Chamber filter clogged.
      SOLUTION
      Remove and clean the chamber filter.

      POSSIBLE CAUSE
      Chamber filter cap mispositioned.
      SOLUTION
      Mount the chamber filter cap properly (see chapter “Monthly or 50-cycle maintenance - Cleaning the chamber filter” in the Instructions for Use).

      POSSIBLE CAUSE
      Load incorrectly placed.
      SOLUTION
      Follow the recommendations as listed in chapter “Load maintenance and preparation” in the Instructions for Use.
    • Stains or spots on instruments.
      POSSIBLE CAUSE
      Instruments rinsed with tap water and not dried before sterilization.
      SOLUTION
      Ensure that instruments are rinsed with distilled or demineralized water and completely dry before they are placed in the sterilizer.

      POSSIBLE CAUSE
      Use of water of poor quality or water containing chemical substances.
      SOLUTION
      Drain both water tanks. Use good quality water (see chapter “Water quality” in the Instructions for Use).

      POSSIBLE CAUSE
      Organic or chemical residues on the instruments
      SOLUTION
      Clean, rinse and dry instruments before placing them in the sterilizer (see chapter “Load maintenance and preparation” in the Instructions for Use.

      POSSIBLE CAUSE
      Dirt in chamber, trays, tray rack.
      SOLUTION
      Clean the chamber and wash the chamber furniture.

      POSSIBLE CAUSE
      Contact between instruments of different materials.
      SOLUTION
      Ensure that instruments of different materials do not touch each other (aluminium, carbon or stainless steel, etc.); place them on different trays or cassettes or pouch them (see chapter “Load maintenance and preparation” in the Instructions for Use).

      POSSIBLE CAUSE
      Scale deposits on the chamber.
      SOLUTION
      Clean the chamber and use good quality water (see chapter “Water quality” in the Instructions for Use).
    • Instruments are turning brown or black.
      POSSIBLE CAUSE
      Incorrect temperature selected.
      SOLUTION
      Select a sterilization cycle featuring a lower sterilization temperature. Follow the instructions of the instrument manufacturer.
    • No cycles are stored in the cycle history menu.
      POSSIBLE CAUSE
      An electronic board was replaced when serviced.
      SOLUTION
      The memory of the old board can not be restored. Consult the cycle history in the USB pen drive.
    • When starting a cycle, the chamber door locks but re-opens immediately. The “Open the door” message appears.
      POSSIBLE CAUSE
      Door seal not properly placed.
      SOLUTION
      Ensure that the door seal is correctly inserted around the whole circumference.

      POSSIBLE CAUSE
      Door jammed by external objects or by the load itself.
      SOLUTION
      Remove any objects interfering with the chamber door. Check for interference between the door and the chamber furniture and/or the load.
    • The sterilizer enters into “Standby mode” immediately after being switched on.
      POSSIBLE CAUSE
      The unit was turned off while in standby mode.
      SOLUTION
      Press the standby mode button to exit.
    • At the end of the cycle the display reads “Open the door” but it is not possible to open the door.
      POSSIBLE CAUSE
      The chamber is still under pressure due to an internal malfunction.
      SOLUTION
      Unplug the sterilizer and wait at least three hours: this releases any internal pressure allowing the chamber door to be opened. Then retry. Call service if the problem persists.

      POSSIBLE CAUSE
      The bacteriological filter is blocked.
      SOLUTION
      Remove the bacteriological filter to release the pressure. Replace the filter (see the chapter “400-cycle maintenance – Replacing the bacteriological filter” in the Instructions for Use). Note that bacteriological filters need to be replaced every 400 cycles.
    • The sterilization (PROCESS) phase of a sterilization cycle was longer than expected.
      POSSIBLE CAUSE
      The chamber temperature dropped below the minimum threshold and the software performed a successful recovery.
      SOLUTION
      Wait for cycle completion. If the problem occurs frequently, contact an authorized W&H service partner.
    • Warning about saving to the USB (HTML and SCL files)
      POSSIBLE CAUSE
      The USB mass storage is disconnected or full.
      SOLUTION
      Check presence and condition of the USB pen drive. If the problem persist, contact an authorized W&H service partner.
    • Warning about programmed maintenance.
      POSSIBLE CAUSE
      The maintenance program needs to be carried out.
      SOLUTION
      Contact an authorized W&H service partner.
    • The cycle report printer does not work.
      POSSIBLE CAUSE
      Printer not properly connected or not powered.
      SOLUTION
      Check the data and power connection to the printer.
    • The sterilizer is connected to an automated water supply system, there is no clean water in the tank and the automatic water filling does not fill the water.
      POSSIBLE CAUSE
      Water filling system not connected.
      SOLUTION
      Connect the water filling system to the sterilizer. (see ANNEX 7 For water quality requirements see chapter “Water quality” in the Instructions For Use).

      POSSIBLE CAUSE
      When the water filling system attempted to fill the tank, water was temporarily unavailable.
      SOLUTION
      Since the water tank filling is attempted only once in-between cycle execution, this event inhibits water feeding. Switch the sterilizer OFF and then ON again.
      Check the external water supply system.
      Check for water leaks from the sterilizer.

      POSSIBLE CAUSE
      Faulty MIN water level sensor in the clean water tank.
      SOLUTION
      Contact an authorized W&H service partner.
    • Warning about consumable replacement.
      POSSIBLE CAUSE
      A consumable needs to be replaced.
      SOLUTION
      Order the requested consumable (door seal, dust filter, bacteriological filter) and replace it. See the chapter “Maintenance” in the Instructions for Use.
    • What is the maximum noise level of the Lara sterilizer?
      The max. noise level of Lara is 66.9 dB.
    • Should I call the service station before sending equipment for repair?
      If you are not sure what the cause of the problem is, it is better to call the service station and talk to a technician. Together with the technician it can be determined what needs to be sent in and sometimes it is possible to even solve the problem right away.
  • Lina (28)
    • Do I need to carry out periodic testing on my Lisa/Lina/Lara/Lyla?
      Lisa/Lina/Lara/Lyla features test cycles (B&D/Helix test, Vacuum test). Compulsory and frequency of testing are regulated by local/national guidelines.
    • What is validation?
      Validation is a testing procedure carried out by an official authority, proving the effectiveness of your sterilizer. Compulsories and frequency of validation are regulated by local/national guidelines.
    • What periodic tests do I need to carry out on my Lisa/Lina/Lara sterilizer?
      Country/regional specific laws and guidelines referring to periodical testing or routine monitoring are individual and must be considered. Our recommendation for periodical testing is mentioned in the delivered IFU and depends on the integrated features in your sterilizer.
    • Do I need to document the results of all periodic tests?
      W&H recommends recording all periodic tests, repairs and modifications on the sterilizer in a logbook including date and signature of the person who carried out the test or other activity. Compulsories of recording is regulated by local/national guidelines.
    • How long should I archive the documentation of regular tests?
      Keep the results according to your country/regional specific laws and guidelines. Those records can be of assistance in case of service as well.
    • Does my sterilizer need any periodic qualification/validation?
      Validation generally comprises a range of tests defined in internationally recognised standards. These tests begin for every device with the factory tests at W&H. In addition, corresponding documentation is included with your device. Prior to commissioning the device at your premises, the technician performs further checks to ensure the device functions correctly. Then, depending on the national/regional laws and directives, the device must be subjected to a so-called renewed performance qualification at regular intervals. For further information, please contact your dealer.
    • Whom should I contact to validate and maintain my sterilizer?
      Validation shall be carried out by an official authority. Maintenance tasks shall be carried out by a qualified and authorised technician.
    • How do I change consumable components on my sterilizer?
      Consumable replacement instructions are provided in the Instructions for Use, chapter “Maintenance”. In addition, a video description is available: • in the sterilizer, in the maintenance section of the menu (only for Lisa); • in the Consumables & Accessories and Video Tutorial section of this web site.
    • How do I clean the water tanks and what products should I use?
      Water tank cleaning instructions are provided in the Instructions for Use, chapter “Maintenance”. Information and videos relating to the cleaning of the water tanks and cleaning products can also be found on the Video Tutorial section of this web site.
    • Which water quality should I use for my sterilizer?
      The water quality for sterilizers is internationally specified by standards and directives. The reasons for this are that your sterilizer can be seriously damaged by it or the sterilization can be jeopardized. Consequently, only water with conductivity of less than 15 µS/cm should be used for your W&H sterilizer. The Multidem system is especially suited to preparing suitable water (see chapter “Water quality” in the Instructions for Use).
    • Should I pouch/wrap my instruments and how long can I store them after sterilization?
      To ensure that your instruments are stored in a sterile state from their successful sterilization until they are used, W&H recommends wrapping them in suitable sterile barrier systems before sterilization. The recommended storage period can be found in the recommendations of the wrapping material manufacturer. For further information, please contact your dealer.
    • The sterilizer remains switched OFF.
      POSSIBLE CAUSE
      The main switch or network circuit breaker is OFF.
      SOLUTION
      Activate the main switch or network circuit breaker (ON).

      POSSIBLE CAUSE
      No voltage at the socket.
      SOLUTION
      Check the building electrical supply.

      POSSIBLE CAUSE
      The power cord is not connected properly.
      SOLUTION
      Check and connect the power cord properly.
    • Water is leaking at the front of the sterilizer.
      POSSIBLE CAUSE
      Leaks through the chamber door seal.
      SOLUTION
      Clean or replace the door seal. Clean the door surface facing the chamber.

      POSSIBLE CAUSE
      Internal leak.
      SOLUTION
      Contact an authorized W&H service partner.
    • The cycle starts but there is no rise in pressure/temperature.
      POSSIBLE CAUSE
      The safety thermostat is open.
      SOLUTION
      Reset the safety thermostat (see chapter “Reset the safety thermostat” in the Instructions for Use).

      POSSIBLE CAUSE
      Electric/electronic fault
      SOLUTION
      Contact an authorized W&H service partner.
    • At the end of the cycle, there is residual water in the chamber.
      POSSIBLE CAUSE
      Sterilizer not properly levelled.
      SOLUTION
      Place the sterilizator on a flat, level surface.

      POSSIBLE CAUSE
      Overloaded chamber.
      SOLUTION
      Comply with the maximum load weight limits for each type of load. Always use the chamber rack for trays and cassettes.

      POSSIBLE CAUSE
      Chamber filter clogged.
      SOLUTION
      Remove and clean the chamber filter.

      POSSIBLE CAUSE
      Chamber filter cap mispositioned.
      SOLUTION
      Mount the chamber filter cap properly (see chapter “Monthly or 50-cycle maintenance - Cleaning the chamber filter” in the Instructions for Use).

      POSSIBLE CAUSE
      Load incorrectly placed.
      SOLUTION
      Follow the recommendations as listed in chapter “Load maintenance and preparation” in the Instructions for Use.
    • Stains or spots on instruments.
      POSSIBLE CAUSE
      Instruments rinsed with tap water and not dried before sterilization.
      SOLUTION
      Ensure that instruments are rinsed with distilled or demineralized water and completely dry before they are placed in the sterilizer.

      POSSIBLE CAUSE
      Use of water of poor quality or water containing chemical substances.
      SOLUTION
      Drain both water tanks. Use good quality water (see chapter “Water quality” in the Instructions for Use).

      POSSIBLE CAUSE
      Organic or chemical residues on the instruments
      SOLUTION
      Clean, rinse and dry instruments before placing them in the sterilizer (see chapter “Load maintenance and preparation” in the Instructions for Use.

      POSSIBLE CAUSE
      Dirt in chamber, trays, tray rack.
      SOLUTION
      Clean the chamber and wash the chamber furniture.

      POSSIBLE CAUSE
      Contact between instruments of different materials.
      SOLUTION
      Ensure that instruments of different materials do not touch each other (aluminium, carbon or stainless steel, etc.); place them on different trays or cassettes or pouch them (see chapter “Load maintenance and preparation” in the Instructions for Use).

      POSSIBLE CAUSE
      Scale deposits on the chamber.
      SOLUTION
      Clean the chamber and use good quality water (see chapter “Water quality” in the Instructions for Use).
    • Instruments are turning brown or black.
      POSSIBLE CAUSE
      Incorrect temperature selected.
      SOLUTION
      Select a sterilization cycle featuring a lower sterilization temperature. Follow the instructions of the instrument manufacturer.
    • No cycles are stored in the cycle history menu.
      POSSIBLE CAUSE
      An electronic board was replaced when serviced.
      SOLUTION
      The memory of the old board can not be restored. Consult the cycle history in the USB pen drive.
    • When starting a cycle, the chamber door locks but re-opens immediately. The “Open the door” message appears.
      POSSIBLE CAUSE
      Door seal not properly placed.
      SOLUTION
      Ensure that the door seal is correctly inserted around the whole circumference.

      POSSIBLE CAUSE
      Door jammed by external objects or by the load itself.
      SOLUTION
      Remove any objects interfering with the chamber door. Check for interference between the door and the chamber furniture and/or the load.
    • The sterilizer enters into “Standby mode” immediately after being switched on.
      POSSIBLE CAUSE
      The unit was turned off while in standby mode.
      SOLUTION
      Press the standby mode button to exit.
    • At the end of the cycle the display reads “Open the door” but it is not possible to open the door.
      POSSIBLE CAUSE
      The chamber is still under pressure due to an internal malfunction.
      SOLUTION
      Unplug the sterilizer and wait at least three hours: this releases any internal pressure allowing the chamber door to be opened. Then retry. Call service if the problem persists.

      POSSIBLE CAUSE
      The bacteriological filter is blocked.
      SOLUTION
      Remove the bacteriological filter to release the pressure. Replace the filter (see the chapter “400-cycle maintenance – Replacing the bacteriological filter” in the Instructions for Use). Note that bacteriological filters need to be replaced every 400 cycles.
    • The sterilization (PROCESS) phase of a sterilization cycle was longer than expected.
      POSSIBLE CAUSE
      The chamber temperature dropped below the minimum threshold and the software performed a successful recovery.
      SOLUTION
      Wait for cycle completion. If the problem occurs frequently, contact an authorized W&H service partner.
    • Warning about saving to the USB (HTML and SCL files)
      POSSIBLE CAUSE
      The USB mass storage is disconnected or full.
      SOLUTION
      Check presence and condition of the USB pen drive. If the problem persist, contact an authorized W&H service partner.
    • Warning about programmed maintenance.
      POSSIBLE CAUSE
      The maintenance program needs to be carried out.
      SOLUTION
      Contact an authorized W&H service partner.
    • The cycle report printer does not work.
      POSSIBLE CAUSE
      Printer not properly connected or not powered.
      SOLUTION
      Check the data and power connection to the printer.
    • The sterilizer is connected to an automated water supply system, there is no clean water in the tank and the automatic water filling does not fill the water.
      POSSIBLE CAUSE
      Water filling system not connected.
      SOLUTION
      Connect the water filling system to the sterilizer. (see ANNEX 7 For water quality requirements see chapter “Water quality” in the Instructions For Use).

      POSSIBLE CAUSE
      When the water filling system attempted to fill the tank, water was temporarily unavailable.
      SOLUTION
      Since the water tank filling is attempted only once in-between cycle execution, this event inhibits water feeding. Switch the sterilizer OFF and then ON again.
      Check the external water supply system.
      Check for water leaks from the sterilizer.

      POSSIBLE CAUSE
      Faulty MIN water level sensor in the clean water tank.
      SOLUTION
      Contact an authorized W&H service partner.
    • Warning about consumable replacement.
      POSSIBLE CAUSE
      A consumable needs to be replaced.
      SOLUTION
      Order the requested consumable (door seal, dust filter, bacteriological filter) and replace it. See the chapter “Maintenance” in the Instructions for Use.
    • Should I call the service station before sending equipment for repair?
      If you are not sure what the cause of the problem is, it is better to call the service station and talk to a technician. Together with the technician it can be determined what needs to be sent in and sometimes it is possible to even solve the problem right away.
  • Lisa (29)
    • Do I need to carry out periodic testing on my Lisa/Lina/Lara/Lyla?
      Lisa/Lina/Lara/Lyla features test cycles (B&D/Helix test, Vacuum test). Compulsory and frequency of testing are regulated by local/national guidelines.
    • What is validation?
      Validation is a testing procedure carried out by an official authority, proving the effectiveness of your sterilizer. Compulsories and frequency of validation are regulated by local/national guidelines.
    • What periodic tests do I need to carry out on my Lisa/Lina/Lara sterilizer?
      Country/regional specific laws and guidelines referring to periodical testing or routine monitoring are individual and must be considered. Our recommendation for periodical testing is mentioned in the delivered IFU and depends on the integrated features in your sterilizer.
    • Do I need to document the results of all periodic tests?
      W&H recommends recording all periodic tests, repairs and modifications on the sterilizer in a logbook including date and signature of the person who carried out the test or other activity. Compulsories of recording is regulated by local/national guidelines.
    • How long should I archive the documentation of regular tests?
      Keep the results according to your country/regional specific laws and guidelines. Those records can be of assistance in case of service as well.
    • Does my sterilizer need any periodic qualification/validation?
      Validation generally comprises a range of tests defined in internationally recognised standards. These tests begin for every device with the factory tests at W&H. In addition, corresponding documentation is included with your device. Prior to commissioning the device at your premises, the technician performs further checks to ensure the device functions correctly. Then, depending on the national/regional laws and directives, the device must be subjected to a so-called renewed performance qualification at regular intervals. For further information, please contact your dealer.
    • Whom should I contact to validate and maintain my sterilizer?
      Validation shall be carried out by an official authority. Maintenance tasks shall be carried out by a qualified and authorised technician.
    • How do I change consumable components on my sterilizer?
      Consumable replacement instructions are provided in the Instructions for Use, chapter “Maintenance”. In addition, a video description is available: • in the sterilizer, in the maintenance section of the menu (only for Lisa); • in the Consumables & Accessories and Video Tutorial section of this web site.
    • How do I clean the water tanks and what products should I use?
      Water tank cleaning instructions are provided in the Instructions for Use, chapter “Maintenance”. Information and videos relating to the cleaning of the water tanks and cleaning products can also be found on the Video Tutorial section of this web site.
    • Which water quality should I use for my sterilizer?
      The water quality for sterilizers is internationally specified by standards and directives. The reasons for this are that your sterilizer can be seriously damaged by it or the sterilization can be jeopardized. Consequently, only water with conductivity of less than 15 µS/cm should be used for your W&H sterilizer. The Multidem system is especially suited to preparing suitable water (see chapter “Water quality” in the Instructions for Use).
    • Should I pouch/wrap my instruments and how long can I store them after sterilization?
      To ensure that your instruments are stored in a sterile state from their successful sterilization until they are used, W&H recommends wrapping them in suitable sterile barrier systems before sterilization. The recommended storage period can be found in the recommendations of the wrapping material manufacturer. For further information, please contact your dealer.
    • The sterilizer remains switched OFF.
      POSSIBLE CAUSE
      The main switch or network circuit breaker is OFF.
      SOLUTION
      Activate the main switch or network circuit breaker (ON).

      POSSIBLE CAUSE
      No voltage at the socket.
      SOLUTION
      Check the building electrical supply.

      POSSIBLE CAUSE
      The power cord is not connected properly.
      SOLUTION
      Check and connect the power cord properly.
    • Water is leaking at the front of the sterilizer.
      POSSIBLE CAUSE
      Leaks through the chamber door seal.
      SOLUTION
      Clean or replace the door seal. Clean the door surface facing the chamber.

      POSSIBLE CAUSE
      Internal leak.
      SOLUTION
      Contact an authorized W&H service partner.
    • The cycle starts but there is no rise in pressure/temperature.
      POSSIBLE CAUSE
      The safety thermostat is open.
      SOLUTION
      Reset the safety thermostat (see chapter “Reset the safety thermostat” in the Instructions for Use).

      POSSIBLE CAUSE
      Electric/electronic fault
      SOLUTION
      Contact an authorized W&H service partner.
    • At the end of the cycle, there is residual water in the chamber.
      POSSIBLE CAUSE
      Sterilizer not properly levelled.
      SOLUTION
      Place the sterilizator on a flat, level surface.

      POSSIBLE CAUSE
      Overloaded chamber.
      SOLUTION
      Comply with the maximum load weight limits for each type of load. Always use the chamber rack for trays and cassettes.

      POSSIBLE CAUSE
      Chamber filter clogged.
      SOLUTION
      Remove and clean the chamber filter.

      POSSIBLE CAUSE
      Chamber filter cap mispositioned.
      SOLUTION
      Mount the chamber filter cap properly (see chapter “Monthly or 50-cycle maintenance - Cleaning the chamber filter” in the Instructions for Use).

      POSSIBLE CAUSE
      Load incorrectly placed.
      SOLUTION
      Follow the recommendations as listed in chapter “Load maintenance and preparation” in the Instructions for Use.
    • Stains or spots on instruments.
      POSSIBLE CAUSE
      Instruments rinsed with tap water and not dried before sterilization.
      SOLUTION
      Ensure that instruments are rinsed with distilled or demineralized water and completely dry before they are placed in the sterilizer.

      POSSIBLE CAUSE
      Use of water of poor quality or water containing chemical substances.
      SOLUTION
      Drain both water tanks. Use good quality water (see chapter “Water quality” in the Instructions for Use).

      POSSIBLE CAUSE
      Organic or chemical residues on the instruments
      SOLUTION
      Clean, rinse and dry instruments before placing them in the sterilizer (see chapter “Load maintenance and preparation” in the Instructions for Use.

      POSSIBLE CAUSE
      Dirt in chamber, trays, tray rack.
      SOLUTION
      Clean the chamber and wash the chamber furniture.

      POSSIBLE CAUSE
      Contact between instruments of different materials.
      SOLUTION
      Ensure that instruments of different materials do not touch each other (aluminium, carbon or stainless steel, etc.); place them on different trays or cassettes or pouch them (see chapter “Load maintenance and preparation” in the Instructions for Use).

      POSSIBLE CAUSE
      Scale deposits on the chamber.
      SOLUTION
      Clean the chamber and use good quality water (see chapter “Water quality” in the Instructions for Use).
    • Instruments are turning brown or black.
      POSSIBLE CAUSE
      Incorrect temperature selected.
      SOLUTION
      Select a sterilization cycle featuring a lower sterilization temperature. Follow the instructions of the instrument manufacturer.
    • No cycles are stored in the cycle history menu.
      POSSIBLE CAUSE
      An electronic board was replaced when serviced.
      SOLUTION
      The memory of the old board can not be restored. Consult the cycle history in the USB pen drive.
    • When starting a cycle, the chamber door locks but re-opens immediately. The “Open the door” message appears.
      POSSIBLE CAUSE
      Door seal not properly placed.
      SOLUTION
      Ensure that the door seal is correctly inserted around the whole circumference.

      POSSIBLE CAUSE
      Door jammed by external objects or by the load itself.
      SOLUTION
      Remove any objects interfering with the chamber door. Check for interference between the door and the chamber furniture and/or the load.
    • The sterilizer enters into “Standby mode” immediately after being switched on.
      POSSIBLE CAUSE
      The unit was turned off while in standby mode.
      SOLUTION
      Press the standby mode button to exit.
    • At the end of the cycle the display reads “Open the door” but it is not possible to open the door.
      POSSIBLE CAUSE
      The chamber is still under pressure due to an internal malfunction.
      SOLUTION
      Unplug the sterilizer and wait at least three hours: this releases any internal pressure allowing the chamber door to be opened. Then retry. Call service if the problem persists.

      POSSIBLE CAUSE
      The bacteriological filter is blocked.
      SOLUTION
      Remove the bacteriological filter to release the pressure. Replace the filter (see the chapter “400-cycle maintenance – Replacing the bacteriological filter” in the Instructions for Use). Note that bacteriological filters need to be replaced every 400 cycles.
    • The sterilization (PROCESS) phase of a sterilization cycle was longer than expected.
      POSSIBLE CAUSE
      The chamber temperature dropped below the minimum threshold and the software performed a successful recovery.
      SOLUTION
      Wait for cycle completion. If the problem occurs frequently, contact an authorized W&H service partner.
    • Warning about saving to the USB (HTML and SCL files)
      POSSIBLE CAUSE
      The USB mass storage is disconnected or full.
      SOLUTION
      Check presence and condition of the USB pen drive. If the problem persist, contact an authorized W&H service partner.
    • Warning about programmed maintenance.
      POSSIBLE CAUSE
      The maintenance program needs to be carried out.
      SOLUTION
      Contact an authorized W&H service partner.
    • The cycle report printer does not work.
      POSSIBLE CAUSE
      Printer not properly connected or not powered.
      SOLUTION
      Check the data and power connection to the printer.
    • The sterilizer is connected to an automated water supply system, there is no clean water in the tank and the automatic water filling does not fill the water.
      POSSIBLE CAUSE
      Water filling system not connected.
      SOLUTION
      Connect the water filling system to the sterilizer. (see ANNEX 7 For water quality requirements see chapter “Water quality” in the Instructions For Use).

      POSSIBLE CAUSE
      When the water filling system attempted to fill the tank, water was temporarily unavailable.
      SOLUTION
      Since the water tank filling is attempted only once in-between cycle execution, this event inhibits water feeding. Switch the sterilizer OFF and then ON again.
      Check the external water supply system.
      Check for water leaks from the sterilizer.

      POSSIBLE CAUSE
      Faulty MIN water level sensor in the clean water tank.
      SOLUTION
      Contact an authorized W&H service partner.
    • Warning about consumable replacement.
      POSSIBLE CAUSE
      A consumable needs to be replaced.
      SOLUTION
      Order the requested consumable (door seal, dust filter, bacteriological filter) and replace it. See the chapter “Maintenance” in the Instructions for Use.
    • What is the maximum noise level of the Lisa sterilizer?
      The max. noise level of Lisa 2019 is 64.3 dB.
    • Should I call the service station before sending equipment for repair?
      If you are not sure what the cause of the problem is, it is better to call the service station and talk to a technician. Together with the technician it can be determined what needs to be sent in and sometimes it is possible to even solve the problem right away.
  • Lexa (2)
    • What is validation?
      Validation is a testing procedure carried out by an official authority, proving the effectiveness of your sterilizer. Compulsories and frequency of validation are regulated by local/national guidelines.
    • Should I call the service station before sending equipment for repair?
      If you are not sure what the cause of the problem is, it is better to call the service station and talk to a technician. Together with the technician it can be determined what needs to be sent in and sometimes it is possible to even solve the problem right away.

Accessories

  • Multidem (2)
    • Which water quality should I use for my sterilizer?
      The water quality for sterilizers is internationally specified by standards and directives. The reasons for this are that your sterilizer can be seriously damaged by it or the sterilization can be jeopardized. Consequently, only water with conductivity of less than 15 µS/cm should be used for your W&H sterilizer. The Multidem system is especially suited to preparing suitable water (see chapter “Water quality” in the Instructions for Use).
    • Should I call the service station before sending equipment for repair?
      If you are not sure what the cause of the problem is, it is better to call the service station and talk to a technician. Together with the technician it can be determined what needs to be sent in and sometimes it is possible to even solve the problem right away.

Surgical Devices

Straight & Contra-angle Handpieces

Saw Handpieces