Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Remove DHW microswitch from the differential valve
Observation:
Confirm correct operation of DHW differential valve spindle.
TEST 1. Turn DHW tap on, does the spindle extend ?
TEST 2. Turn DHW tap off, does the spindle retract ?
TEST 1. Turn DHW tap on, does the spindle extend ?
TEST 2. Turn DHW tap off, does the spindle retract ?
Isolate as per TOPs P4
and refit as necessary