Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Gain access to PCB (use Insulation Mat as required)
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure for DC voltage across pin14 (red lead) of connector X2 and a suitable earth connection.
The voltage measured will vary according to the primary system pressure but should conform approximately to the table below;
Is the voltage measured 1.0 Vdc or greater?
The voltage measured will vary according to the primary system pressure but should conform approximately to the table below;
Is the voltage measured 1.0 Vdc or greater?
Isolate as per TOPs P4
and refit as necessary