Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Both Temperature Dials up to Max
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Observation:
Measure the voltage between an earth connection and each of the pins listed in the table below at connector X50, with pin 1 being the top left.
(Use the electrical insulation mat as necessary whilst carrying out this test).
The voltages should conform approximately to the table below:
(Use the electrical insulation mat as necessary whilst carrying out this test).
The voltages should conform approximately to the table below:
| Approx. Voltages | Pin 1 = 5vdc | Pin 5 = 5vdc |
| Pin 2 = 5vdc | Pin 6 = 0vdc |
| Pin 3 = 0vdc | Pin 7 = 5vdc |
| Pin 4 = 5vdc | Pin 8 = 23vdc |
Isolate as per TOPs P4
and refit as necessary