Set Appliance State:
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Isolate Mains Power to appliance as per TOPs P4
Remove connector (brown wires) from the gas valve
DHW temperature selector at maximum
Remove connector (brown wires) from the gas valve
DHW temperature selector at maximum
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Appliance On/Off control set to ON position.
Reset lockout as necessary.
Allow ignition sequence to commence.
After approximately 10 seconds measure voltage at disconnected connector.
Expected voltage approximately 15V DC or greater.
Reset lockout as necessary.
Allow ignition sequence to commence.
After approximately 10 seconds measure voltage at disconnected connector.
Expected voltage approximately 15V DC or greater.
Isolate as per TOPs P4
and refit as necessary