Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Turn Hot Water Tap On
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Reset appliance if required.
When the fan starts measure for DC volts across pin 3 (Orange lead) connector X20 and a suitable earth connection.
Expected voltage approximately 5.5 Vdc.
Note.
1. Pins are numbered on the connectors.
2. Appliance may enter lockout during test reset appliance as required until test complete.
When the fan starts measure for DC volts across pin 3 (Orange lead) connector X20 and a suitable earth connection.
Expected voltage approximately 5.5 Vdc.
Note.
1. Pins are numbered on the connectors.
2. Appliance may enter lockout during test reset appliance as required until test complete.
Isolate as per TOPs P4
and refit as necessary