VOLTAGE RECTIFICATION - BURNER IGNITED

Set Appliance State:

Mains Power Off

Set Multimeter to DC Volts

Turn Hot Water Tap On

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

Mains Power On

Measurement:

Reset appliance if required.
Measure for DC voltage across pin 1 (brown lead) of
connector X21 and a suitable earth connection.
While burner is alight, voltage at the meter should read approximately -5 Vdc.

gw betacom 28a pcb connectors x2 x20 x21.gif

Burner ignited, sparking continues

Note.
1. Ensure a good connection is made as misdiagnosis will occur.
2. With burner alight, sparking will continue for approximately 4 seconds, then restarts after approximately 6 seconds. This will be repeated 5 times before lockout occurs, reset as required until test complete.