Set Appliance State:
Mains Power Off
Set Multimeter to DC Volts 
| WARNING! - Mains voltage is expected during test follow TOPs P4 live testing procedure |
Measurement:
Slowly begin to pressurise system.
Measure the DC voltage across the red lead (pressure sensor connector) and
terminal 2 (blue) main terminal block, as pressure is applied to system this
voltage should be seen to rise?
Note.
Terminal 1 of main terminal block is the top connection when facing appliance front.
Measure the DC voltage across the red lead (pressure sensor connector) and
terminal 2 (blue) main terminal block, as pressure is applied to system this
voltage should be seen to rise?
| System pressure | Voltage dc |
| 1 bar | 1.0 |
| 2 bar | 2.0 |
| 3 bar | 3.0 |
Note.
Terminal 1 of main terminal block is the top connection when facing appliance front.
Isolate as per TOPs P4
and refit as necessary