Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
CH Demand
Remove X31 (programmer) connector from the PCB and make safe
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
With X31 connector removed does the boiler respond to a CH demand?
Isolate as per TOPs P4
and refit as necessary