Set Appliance State:
Mains Power Off
Set Multimeter to Resistance 
Heating temperature selector to OFF
Hot water temperature selector to mid-range
Ensure heatbank is not up to temperature (this can be achieved by running the DHW with the mains power to the appliance on and the pilot switched off)
Hot water temperature selector to mid-range
Ensure heatbank is not up to temperature (this can be achieved by running the DHW with the mains power to the appliance on and the pilot switched off)
Gas On; Pilot On
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Allow boiler to heat the heatbank to approximately 70 degrees C.
Remove one of the pink wires (1) from the DHW thermostat.
Measure the resistance across the thermostat terminals.
Replace wire after test.
| Isolate Mains Power to appliance as per TOPs P4 |
Remove one of the pink wires (1) from the DHW thermostat.
Measure the resistance across the thermostat terminals.
Replace wire after test.
Isolate as per TOPs P4
and refit as necessary