[rufusw5]

Re: Hotpoint FFA97 Thermistor

Just a thought… I’ve used thermistors before as temperature sensors and they’re not expensive components. They usually cost about 20p. Looking at Hotpoint prices would certainly lead me to think otherwise, I know genuine thermistors are potted, which has the obvious benefit of preventing water from seeping in.

Now most thermistors won’t be suitable for potting, but should be heatshrink sealable (Heatshrink over the sensor and shrink it to seal the sensor in). You’d need to use glued HS to make sure it seals properly or they’ll fail frequently (Looking at the ones made for Mistral FF’s I guess this is what happens to them).

Just wondering if anyone’s tried using regular thermistors?

The one’s in the FFA97 freezer section seem to be about 10k.. Might be worth a try…

It actually seems to work fine as is, since these are NTC thermistors it’ll be stuck at max cold for the green one due to infinite resistance when disconnected, so probably thinks it’s frozen up.

If i was writing the software, I would measure the temp difference between the two freezer thermistors over a time frame, using an algorythm i’d be able to tell whether it was iced by the difference in rate of change.. I expect when iced up the green one would warm up far slower than the red one due to it’s ice blanket.

But to protect against being stuck in defrost mode I would have a defrost timer, maybe 24 hours minimum between defrosts

So my assumption is that without that thermistor it’s defrosting on the timer, probably too frequently, which might not be a bad thing given that these apparently ice up pretty bad.

It does make you wonder though.. What if the icing up problems these are known to suffer from are a result of a bad thermistor, slightly out of range, so it doesn’t defrost often enough?

Looks like I’m talking to myself here anyways.. no harm in thinking out loud I guess

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