Set Appliance State:
Set Multimeter to DC Volts 
Hot water tap ON and fully open
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Allow the burner to ignite and establish.
After 10 seconds measure the DC voltage across the two wires.
Expect 12.5 vdc or greater.
Is the voltage measured as expected?
After 10 seconds measure the DC voltage across the two wires.
Expect 12.5 vdc or greater.
Is the voltage measured as expected?
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Isolate as per TOPs P4
and refit as necessary