Set Appliance State:
| Isolate Mains Power to appliance as per TOPs P4 |
Disconnect connector from X22 on the PCB
Note:
Ensure the sensor is correctly attached to the pipe
Note:
Ensure the sensor is correctly attached to the pipe
Measurement:
Measure resistance across the two blue leads pins 12 & 13 at the disconnected connector.

Isolate as per TOPs P4
and refit as necessary