Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Drain boiler DHW circuit
Remove DHW flow sensor
(this will require removal of flue pipe / sump)
Remove DHW flow sensor
(this will require removal of flue pipe / sump)
Observation:
Inspect DHW flow sensor for restrictions or blockages.
Isolate as per TOPs P4
and refit as necessary