Set Appliance State:

Mains Power Off
Set Multimeter to AC Volts Set meter to measure AC Volts
Ensure NO demand
ECO mode ON
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:


Measure for mains voltage across brown and blue leads on connector ST4 on the PCB.
Note:
Following the set-up instructions for this test is critical for correct diagnosis. Failure to carry out the mains power off request, leaving the preheat function on or leaving a demand on will result in misdiagnosis.