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The compressor is not turning off so it would seem the temperature sensing is broken. There is a PCB inside the thermostat housing unit and I could see no evidence of temperature sensors anywhere in the fridge. Can someone please confirm that the only temperature sensor is the PCB and that there is no other control board for this machine? Thank you, Mark
1 if it was running all the time it would be very very cold in there
2 the temp sensor will be buried in the insulation i would guess as the lamp would interfere with the sensor if it was that close
if its not freezing sounds more like a system fault or its just that its hot weather and it has to work harder
Dave
electrofix wrote: 1 if it was running all the time it would be very very cold in there
Apologies I should have given more info. It is actually freezing food Dave.
Sensor buried in the insulation… did they do that 10 years ago? (This fridge is at least 10 years old)
Is there any locations on the internet where I can find schematics for this, and other machines?
Thanks, MarkI asked chatgpt if this model of refrigerator used non serviceable sensors. The reply was:
The Hotpoint HS2322L refrigerator does use non-serviceable temperature sensors that are embedded within the insulation. This design choice aligns with the general industry trend during the early 2000s to improve energy efficiency and reliability by integrating sensors into the appliance in a way that reduces the need for maintenance.
electrofix wrote: 1 if it was running all the time it would be very very cold in there
2 the temp sensor will be buried in the insulation i would guess as the lamp would interfere with the sensor if it was that close
if its not freezing sounds more like a system fault or its just that its hot weather and it has to work harder
Dave
I’m still trying to figure this out. I took the sensor of the thermostat board and metered it as 12.5 kohms at room temperature. After just 10-15 mins of the fridge being on – had been at room temperature inside for a day – the resistance on the sensor was up to 75 kohm. Then 10 mins later (fridge off) it had dropped to 30 koms. Does this seem to be an unusual range? I would have expected perhaps 30 kohms at 4 degrees.Anyway, the sensor is buried but I was thinking I could perhaps fix on to the inside wall of the fridge and wire through the thermostat housing on to the PCB. Does this seem like a reasonable idea. The next question would be sourcing a suitable generic sensor as I can’t find a specific one for this model.
Thanks,
Markits finding the correct value thats the problem with the correct temperature / resistance slope
Dave
Thinking about this, the sensor seems to be behaving as expected even though its resistance slope is quite steep, and getting a datasheet for the sensor could take hours of digging. So I think it’s likely the sensor is OK and the PCB thermostat is the problem. These are £100 from Hotpoint and come unprogrammed and I have not tools or experience in programming such a board. Add to this that the fridge is 10 years old. Its days are over.
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