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 the system filling loop
Locate the system filling loop
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the DC voltage between Pin 14 (Green) on X2
and the earth point on the boiler chassis.
Increase the system pressure slowly until the voltage measured reaches approximately 1.7 Vdc, this voltage corresponds to a system pressure of approximately 1 bar (see table below).
and the earth point on the boiler chassis.
Increase the system pressure slowly until the voltage measured reaches approximately 1.7 Vdc, this voltage corresponds to a system pressure of approximately 1 bar (see table below).
| System pressure | Voltage dc | 0 bar | 1.2 |
| 1 bar | 1.7 |
| 2 bar | 2.2 |
| 3 bar | 2.8 |
