Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Set Multimeter to DC Volts 
Ensure system pressure is set between 0.6 and 1.5bar
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Measure the voltage between the red wire (7th up from the bottom at connector X22) from the low pressure switch and the neutral at the incoming mains terminal strip.
The Voltages should conform to the table below:
The Voltages should conform to the table below:
| Pressure (Bar) | DC Volts | 0.5 | 1.1 |
| 1.0 | 1.6 |
| 1.5 | 2.5 |
| 2.0 | 3.1 |
| 2.5 | 4.1 |
Isolate as per TOPs P4
and refit as necessary