Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Remove wiring from terminals 3 and 4 and make safe
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
With the external controls removed does the boiler still fire for central heating?
Isolate as per TOPs P4
and refit as necessary