Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Remove the connector from the low water pressure sensor and make safe
Refit connector X2 (blue) at the PCB if you have not already done so
Refit connector X2 (blue) at the PCB if you have not already done so
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Test 1:
Measure the voltage between pin 2 at X35
on the PCB to a suitable earth point.
Voltage should be approximately 22V DC.
Test 2:
Measure the voltage between pin 4 at X35
on the PCB to a suitable earth point.
Voltage should be approximately 5V DC.
Measure the voltage between pin 2 at X35
on the PCB to a suitable earth point.
Voltage should be approximately 22V DC.
Test 2:
Measure the voltage between pin 4 at X35
on the PCB to a suitable earth point.
Voltage should be approximately 5V DC.
 x35 on pcb.jpg)
Isolate as per TOPs P4
and refit as necessary