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:
Measure for DC voltage across the yellow lead (pressure sensor connector)
and terminal 2 (blue) main terminal block.
Expected voltage approximately 5vdc.
Note.
Terminal 1 of main terminal block is the top connection when facing appliance front.
and terminal 2 (blue) main terminal block.
Expected voltage approximately 5vdc.
Note.
Terminal 1 of main terminal block is the top connection when facing appliance front.
Isolate as per TOPs P4
and refit as necessary