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)
Locate primary system filling loop
Locate primary system filling loop
| 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.
Increase the primary system pressure slowly until voltage measured reaches approximately 1.7 Vdc, this voltage corresponds to a system pressure of approximately 1 bar (see table below).
Increase the primary system pressure slowly until voltage measured reaches approximately 1.7 Vdc, this voltage corresponds to a system pressure of approximately 1 bar (see table below).
Isolate as per TOPs P4
and refit as necessary