Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Remove all external control wiring connections and make safe
Ensure NO demands are present
Note.
A new boiler out of the box or a new PCB will have a wire link across the 24 volt external controls connections, this should be removed unless appliance is fitted with EBUS controls
Ensure NO demands are present
Note.
A new boiler out of the box or a new PCB will have a wire link across the 24 volt external controls connections, this should be removed unless appliance is fitted with EBUS controls
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Does the CH symbol still flash (CH demand)?
Isolate as per TOPs P4
and refit as necessary