Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
CH Demand
Remove X11 integral timer plug from PCB and make safe
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Observation:
Does boiler fire for CH with the plug removed?
Isolate as per TOPs P4
and refit as necessary