Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
CH Demand
Remove and disconnect the internal clock or wireless receiver assembly from the boiler.
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
With the internal clock/wireless receiver disconnected, does the boiler light for a Heating demand ?
Isolate as per TOPs P4
and refit as necessary