Isolate Mains Power to appliance as per TOPs P4
Observation:
Move the switch at the bottom of the PCB from the external control position (switched to the right) to the integral control position (switched to the left).
This will allow you to apply and remove a CH/DHW demand using the internal control.
Remember to isolate and put back into external control position once diagnosis is complete.
RETURN TO PREVIOUS TEST
This will allow you to apply and remove a CH/DHW demand using the internal control.
Remember to isolate and put back into external control position once diagnosis is complete.
RETURN TO PREVIOUS TEST
