Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
CH Demand
Disconnect wire marked "SL2 IN" from the mains terminal block at top left of PCB housing and the wires marked "WEATHER COMPENSATION" at top right of PCB housing and make safe
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Does the boiler now operate correctly?
Isolate as per TOPs P4
and refit as necessary