Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Use Insulation Mat as required
NO demand
Gain access to PCB as necessary
NO demand
Gain access to PCB as necessary
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the dc voltage between connection 12 (green) and connection 9 (black) on connector X2.
The voltage measured should correspond approximately with the pressure shown on the manual gauge on the front of the appliance as per the table below:
The voltage measured should correspond approximately with the pressure shown on the manual gauge on the front of the appliance as per the table below:
| System pressure | Voltage dc | 0 bar | 1.2 |
| 1 bar | 1.7 |
| 2 bar | 2.2 |
| 3 bar | 2.8 |
 pressure guage.gif)
Isolate as per TOPs P4
and refit as necessary