Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
4104480 VAILLANT ECOTEC PLUS 618 H SYSTEM HEP
1. Slacken the central screw in the bottom of the appliance outer case.
2. Press the two clips upwards to release the catches and the case can be lifted out at the bottom then lifted off the top edge of the appliance.
3. To gain access to the PCB; Lower the control panel, release the 6 catches on the back of the control panel and withdraw the cover.