Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to AC Volts 
DHW demand from programmer
DHW temperature selector to high setting
Ensure hot water storage vessel is calling for heat
DHW temperature selector to high setting
Ensure hot water storage vessel is calling for heat
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Boiler On/Off switch On.
Reset lockout if necessary.
Measure voltage at the brown lead (live) and the blue lead (neutral) at the pump connector marked ST11 on the PCB.
Note:
Ensure good probe connection to test points.
Reset lockout if necessary.
Measure voltage at the brown lead (live) and the blue lead (neutral) at the pump connector marked ST11 on the PCB.
Note:
Ensure good probe connection to test points.
Isolate as per TOPs P4
and refit as necessary