GAS VALVE 1 VOLTAGE (PRE-HEAT)

Mains Power Off

Set Multimeter to AC Voltage

CH/HW switch in HW position
Ensure that the boiler is cold and ready for Pre-heat
Boiler On/Off switch ON

WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure

Mains Power On

Measure mains voltage across gas valve 1 (pilot solenoid)
red (Live) wire and blue (Neutral) wire.

Red and
blue wires