Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
| WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure |
Measurement:
Measure the DC voltage between Pin 14 (Green) on X25 and a suitable earth.
Voltage should conform approximately to the table below:
Note:
1. Use the manual pressure gauge inside the appliance as the low pressure sensor may be faulty.
2.Each pin on the PCB connector is numbered.
Voltage should conform approximately to the table below:
| System pressure | Voltage dc | 0 bar | 1.2 |
| 1 bar | 1.7 |
| 2 bar | 2.2 |
| 3 bar | 2.8 |
Note:
1. Use the manual pressure gauge inside the appliance as the low pressure sensor may be faulty.
2.Each pin on the PCB connector is numbered.
 pcb in situ.gif)
 connector x2 on pcb.gif)
 pressure guage.gif)
Isolate as per TOPs P4
and refit as necessary