Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
CH Demand
Remove connector from fan assembly and make safe
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Does the boiler now recognise a demand without the symbols and temperature changing randomly?
Isolate as per TOPs P4
and refit as necessary