Replacing PTC heat register

  1. Powerbox H: Remove WS 75 APA/UPA/UPGA cover. Powerbox S: Remove any cover that may be present.
  2. Remove the cover of electronics compartment (2 screws).
  3. Remove the two plastic locking pins on the PTC heat register module and pull the module out of the EPP housing.

  4. CAUTION Risk of burning on hot PTC heat register or hot housing parts.

    Only touch the heat register or housing parts when they have cooled down.

  5. Disconnect the wiring of the PTC heat register and pull the connecting cable out of the cable duct.
  6. Install new PTC heat register as described in the previous chapter.

Only use genuine components.