RESISTANCE DHW SENSOR AT PCB

Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Set Multimeter to Resistance

Disconnect plug connector (marked ST16) from PCB

Observation:

Check resistance across connections 17 & 18 (yellow wires)
The resistance depends on temperature and should conform to the table below:

Temperature °C	Resistance in kOhms
10	19.9
20	12.5
30	8.1
40	5.3
50	3.6
60	2.5
70	1.8
80	1.3

wc 28 cdi fca pcb connections exposed.gif

Note:
Care should be taken that probe tips do not touch each other when taking measurement as a false reading will be given. Also ensure that other end of leads are connected to the DHW sensor.