FAQ

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

Sterilizers

  • Lisa (28)
    • What is the maximum noise level of the sterilizer?
      The max. noise level of Lisa 2019 is 64.3 dB, for Lara it is 66.9 dB.
    • Lisa 17/22
      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 a service engineer.
    • Lisa 17/22
      Warning about saving to the USB (HTML and SCL files)
      POSSIBLE CAUSE
      The USB mass storage is not connected or not properly connected to the sterilizer.
      SOLUTION
      Check presence and connection of the USB pen drive. If the problem persist, contact a service engineer.
    • Lisa 17/22
      Warning about programmed maintenance.
      POSSIBLE CAUSE
      A component needs replacing for the programmed maintenance of the sterilizer.
      SOLUTION
      Order the requested component (door seal, dust filter, bacteriological filter…). See “Maintenance” chapter.
    • Lisa 17/22
      The cycle report printer does not work.
      POSSIBLE CAUSE
      Printer not properly connected or not powered
      SOLUTION
      Check the data and the power connection to the printer.
    • Lisa 17/22
      When the sterilizer is connected to an automated water supply system: there is no clean water in the tank, but the automatic water filling does not fill the water.
      POSSIBLE CAUSE
      Water fill system not connected
      SOLUTION
      Connect the water fill system to the sterilizer (see ANNEX 7 for water quality requirements).

      POSSIBLE CAUSE
      When the water fill system attempted to fill the tank, water was temporarily unavailable
      SOLUTION
      Since 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
      Call service.
    • Lisa 17/22
      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 electric circuit.

      POSSIBLE CAUSE
      The power cord is not connected properly
      SOLUTION
      Check and connect the power cord properly
    • Lisa 17/22
      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.
      SOLUTIONS
      Contact a service engineer.
    • Lisa 17/22
      The cycle commences but there is no rise in pressure/temperature
      POSSIBLE CAUSE
      The thermal overload switch is open
      SOLUTION
      Reset the thermal overload switch (see RESETTING THE THERMAL OVERLOAD).

      POSSIBLE CAUSE
      Electric – electronic fault

      SOLUTION
      Contact a service engineer.
    • Lisa 17/22
      At the end of the cycle, there is residual water in the chamber
      POSSIBLE CAUSE
      Sterilizer not properly levelled
      SOLUTION
      Properly level the surface that the sterilizer is placed on.

      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 MAINTENANCE)

      POSSIBLE CAUSE
      Load incorrectly placed
      SOLUTION
      Follow the recommendations as listed in ANNEX 2.
    • Lisa 17/22
      Corrosion or spots on instruments
      POSSIBLE CAUSE
      Tap water on instruments when placed in the sterilizer
      SOLUTION
      Ensure that instruments are 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 APPENDIX 7).

      POSSIBLE CAUSE
      Organic or chemical residues on the instruments
      SOLUTION
      Clean, rinse and dry instruments before placing them in the sterilizer (see APPENDIX 2).

      POSSIBLE CAUSE
      Chamber, trays, tray rack dirty
      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 (aluminum, carbon or stainless steel, etc.); place them on different trays or cassettes or pouch them (refer to APPENDIX 2).

      POSSIBLE CAUSE
      Scale deposits on the chamber
      SOLUTION
      Clean the chamber and use good quality water (refer to APPENDIX 7).
    • Lisa 17/22
      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.
    • Lisa 17/22
      No cycles are stored in the cycle history menu
      POSSIBLE CAUSE
      An electronic board was replaced when serviced.
      SOLUTION
      None. The memory of the old board cannot be restored. You are advised to Save the history regularly onto the USB pen drive.
    • Lisa 17/22
      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; seal sticking out
      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 that the door does not push against the load or the chamber furniture.
    • Lisa 17/22
      The sterilizer enters into “Sleep mode” immediately after opening the chamber door.
      POSSIBLE CAUSE
      The chamber door has not been opened after the previous cycle had finished and the “Sleep mode delay” has expired
      SOLUTION
      Press the SLEEP MODE button to exit.
    • Lisa 17/22
      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 in vacuum due to an internal malfunction
      SOLUTION
      Switch the sterilizer OFF: this releases any internal pressure allowing the chamber door to be opened. Call technical service if the problem persists.

      POSSIBLE CAUSE
      The bacteriological filter is blocked
      SOLUTION
      Remove the bacteriological filter to release the pressure. Replace the filter. Note that bacteriological filters need to be replaced every 400 cycles.
    • Do I need to carry out periodic testing on my Lisa/Lina?
      Yes, testing is an integral part of ensuring that a small sterilizer consistently performs to operating parameters set during the machines commissioning. Failure to carry out routine periodic tests and maintenance tasks could compromise safety and have legal and insurance-related implications for the registered Manager.
    • What is validation?
      Validation is a documented procedure for collecting, recording and interpreting data required for proving that a procedure constantly complies with the specified specifications. W&H sterilizers feature a process evaluation system, which continually monitors the stipulated specifications (temperature, pressure and time).
    • What periodic tests do I need to carry out on my Lisa/Lina?
      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 testing?
      W&H recommends to record all periodic tests, repairs and modifications on the sterilizer in the logbook including date and signature of the person who carried out the test or other activity.
    • How long should I keep periodic test records?
      Keep the results according your country/regional specific laws and guidelines and the definitions in your QM. Those records can be of assistance in case of service as well.
    • Does my Lisa/Lina 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 get to validate and maintain my Lisa/Lina sterilizer?
      All validation and maintenance work should be performed by a qualified individual.
    • How do I change consumable components on my Lisa/Lina?
      Information and videos relating to consumable components and how to replace them can be found on the Consumables & Accessories and Video Tutorial section of this web site.
    • How do I clean the water tanks and what products should I use?
      Information and videos relating to the cleaning of the water tanks and cleaning products can be found on the Video Tutorial section of this web site.
    • Which water quality should I use for my Lisa/Lina 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 jeopardised. 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.
    • 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 packing them in suitable sterile barrier systems from even before sterilization. The recommended storage periods can be found in your national/regional laws and directives. For further information, please contact your dealer.
    • 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

  • Piezomed (6)
    • How long is the useful service life of the instrument detection?
      The instrument detection is located in the LED socket and is automatically replaced at the same time as the LED socket.
    • How long is the useful service life of the LED?
      The user must replace the LED socket as soon as the protective coating on the LED discolours and the luminous power is impaired as a result. The length of time this takes can differ depending on the type of sterilizer or sterilization process.
    • Can Piezomed instruments also be used on third-party devices?
      No
      a. Different thread
      b. Third-party devices are not engineered for the correct resonance point – instrument fails to oscillate.
    • How long do the instruments last and when should they be replaced?
      The useful service life of the instruments is determined by the length of time they are used - reprocessing and sterilization cycles only have a marginal influence on the live span.
      a. Instruments need to be replaced
      - If there is a loss of cutting power while working
      - In case of visible damage on the cutting portion or the shank of the instrument.
      b. Saws must be replaced if
      - Teeth are broken off
      - Teeth are worn and cutting power drops
      - In case of visible damage on the cutting portion or the shank of the instrument.
      c. Diamond-coated instruments must be replaced
      - As soon as the diamond coating is worn
      - In case of visible damage on the cutting portion or the shank of the instrument.
      - For USA only - Diamond-coated instruments are considered single-use by the FDA.
    • How are the instruments prepared for cleaning?
      a. Preparation in the ultrasonic bath:
      - Place the instruments in the instrument tray and lower into the ultrasonic bath.
      - Use cleaning agents and disinfectants suitable for hand instruments (probes, mirrors, forceps, etc.).
      DO NOT USE a bur bath, as this is very aggressive.
      - After cleaning in the ultrasonic bath, rinse adequately with water to remove any remnants of the cleaning agent and disinfectant from the coolant channels.
      - Blow dry with compressed air after rinsing
      - Replace dried instruments in the instrument tray and package for sterilization

      b. Mechanical preparation in the cleaning unit and disinfector
      - Use the cleaning adapter for cleaning units and disinfectors (see Instructions for Use – Accessories)
      - After preparation in the cleaning unit and disinfector, check that the coolant channels are dry and, if necessary, dry again with compressed air.
    • Can third-party instruments be used on the Piezomed?
      No
      a. Different thread
      b. The Piezomed instrument detection cannot detect third-party instruments

Accessories

  • W&H Osstell ISQ module (1)
    • What does ISQ stand for?
      The abbreviation ISQ stands for Implant Stability Quotient. It is a value between 1 and 100 and gives the surgeon an insight of the implant stability after placing the implant. With the ISQ value the surgeon can monitor the osseointegration.
  • Piezomed Instruments (4)
    • Can Piezomed instruments also be used on third-party devices?
      No
      a. Different thread
      b. Third-party devices are not engineered for the correct resonance point – instrument fails to oscillate.
    • How long do the instruments last and when should they be replaced?
      The useful service life of the instruments is determined by the length of time they are used - reprocessing and sterilization cycles only have a marginal influence on the live span.
      a. Instruments need to be replaced
      - If there is a loss of cutting power while working
      - In case of visible damage on the cutting portion or the shank of the instrument.
      b. Saws must be replaced if
      - Teeth are broken off
      - Teeth are worn and cutting power drops
      - In case of visible damage on the cutting portion or the shank of the instrument.
      c. Diamond-coated instruments must be replaced
      - As soon as the diamond coating is worn
      - In case of visible damage on the cutting portion or the shank of the instrument.
      - For USA only - Diamond-coated instruments are considered single-use by the FDA.
    • How are the instruments prepared for cleaning?
      a. Preparation in the ultrasonic bath:
      - Place the instruments in the instrument tray and lower into the ultrasonic bath.
      - Use cleaning agents and disinfectants suitable for hand instruments (probes, mirrors, forceps, etc.).
      DO NOT USE a bur bath, as this is very aggressive.
      - After cleaning in the ultrasonic bath, rinse adequately with water to remove any remnants of the cleaning agent and disinfectant from the coolant channels.
      - Blow dry with compressed air after rinsing
      - Replace dried instruments in the instrument tray and package for sterilization

      b. Mechanical preparation in the cleaning unit and disinfector
      - Use the cleaning adapter for cleaning units and disinfectors (see Instructions for Use – Accessories)
      - After preparation in the cleaning unit and disinfector, check that the coolant channels are dry and, if necessary, dry again with compressed air.
    • Can third-party instruments be used on the Piezomed?
      No
      a. Different thread
      b. The Piezomed instrument detection cannot detect third-party instruments

Electric Motor

Straight & Contra-angle Handpieces

Straight & Contra-angle Handpieces

Accessories

Turbines

Couplings

Air Scaler

Reprocessing Devices

Saw Handpieces

Straight & Contra-angle Handpieces

Straight & Contra-angle Handpieces

Straight & Contra-angle Handpieces

Laboratory Devices

Prosthodontic Screwdriver

Piezo Scaler

Air Motor

  • 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.
  • Does the air motor need to be greased?
    Yes, the air motor must be lubricated as described in the "Hygiene and care" section of the instructions for use. Please make sure that the controll ring is positioned either to forward or reverse direction.