Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
CH Demand
Disconnect connector X7B for outdoor sensor
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Does "c" now appear on the display, indicating boiler has reacted to demand?
Isolate as per TOPs P4
and refit as necessary