Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Drain boiler and system of water
Observation:
Remove the return isolation valve (right hand 22mm valve).
Inspect the non-return valve for good condition, it should move easily and be free of sludge or debris.
Inspect the non-return valve for good condition, it should move easily and be free of sludge or debris.
Isolate as per TOPs P4
and refit as necessary