Heater Heats Continuously and Can No Longer Be Regulated

Heater heats continuously and can no longer be regulated

Interruption in sensor series. Check outside sensor, interior sensor, and mixing chamber sensor.

Remove control switch and pull plug A.

Outer sensor: Connect ohmmeter with term.9 and ground

Reading:
at 0°C - 34 kohm ± 10%
at 10°C - 20 kohm ± 10%
at 25°C - 10 kohm ± 10%

Interior sensor:Connect ohmmeter with term.2 and ground

Reading: As for outside sensor

Mixing chamber sensor: Connect with term.1 and ground

Reading: As for outside sensor