Set Appliance State:
Mains Power Off
Set Multimeter to DC Volts 
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
This test must be carried out during the fan and pump purge period ( FH displayed) while the fan is running.
Measure the DC voltage between the orange wire (pin 4)
at the 4 wire fan connector and a suitable earth.
Expect approximately 9.9 vdc.
Measure the DC voltage between the orange wire (pin 4)
at the 4 wire fan connector and a suitable earth.
Expect approximately 9.9 vdc.
Isolate as per TOPs P4
and refit as necessary