Fridge-Freezer Problems

On Tue, 26 Jul 2016 09:29:03 +0000, AnthonyL wrote:

Just wondering about something.
There is a known problem with fridge/freezers with only one compressor, when they are somewhere cold.
Because they rely on the fridge thermostat to start the compressor, if the fridge doesn't need cooling (temperature inside similar to temperature outside) then the compressor doesn't run and the freezer defrosts. Had that happen to us once when the fridge/freezer was in the garage over a very cold winter.
I'm now trying to work out if there is a similar effect in very warm weather. If the fridge is cooling more efficiently than the freezer, such that the compressor doesn't run for long enough to get the freezer temperature down, then possibly the freezer might not be able to keep cold enough.
I see that you've tried running the fridge colder but only got the freezer down to -10C. You didn't say how cold it was before you made the adjustment. If you turn the thermostat to max cold and the freezer goes below -10C this might be a pointer.
Cheers
Dave R
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I wasn't really aware that there was a problem until SWIMBO commented that the ice cream was soft so I think at least until the recent warm spell that all was ok with the thermostat unchanged from its setting of 3. So I assume that until recently we were at around -18 to -20 for the freezer and +6 or so for the fridge which is what I would consider normal.
Anyway its all switched on now so we'll see how it is by the evening.
My stand-by freezer has been working fine at around -20 despite not having been on since Xmas. But that is a fairly uncomplicated unit with no fancy auto-defrost/frost free to go wrong.
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snipped-for-privacy@please.invalid (AnthonyL) wrote in wrote:

I fixed one once that had a motor driven sequencer to stop the compressor and run a heater once every 8 hours,
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On Tue, 26 Jul 2016 13:42:42 GMT, snipped-for-privacy@please.invalid (AnthonyL) wrote:

An update and more questions. Fridge/Freezer has been working fine for a week now. Initially I had the thermostat set at 6 (max) but that was too cold, down to 5, still very cold and now at 4 so fridge is at 8c, freezer -20c and seems to have fairly normal on/off cycles.
So I'm not clear on what went wrong and what fixed it.
When I moved the unit out there was a terrible mess underneath - crud + maggots which smelt revolting when some of the evaporator tray contents spilt over. The previous owners had a dog so I suspect some food got under there. It was enough to impede air flow but I would have thought there was enough space elsewhere.
The other thought is that I didn't turn the thermostat to cooler in the heatwave we had so it was still on 3 when getting on for 5 might have been more appropriate. I can see that this might have caused a partial defrost but I don't see why it should clog the system us as per my OP (at the top).
I'm just looking at how to prevent the problem re-arising. Or maybe the thing just needs a twice yearly manual defrost?
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On Wednesday, 3 August 2016 12:55:16 UTC+1, AnthonyL wrote:

Keep thermometers in it & you'll know if it needs adjusting. 8C is to high, fridges should be below 5 or you risk food poisoning.
NT
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No there isnt.

I've never seen that happens and we can get 10 days in a row over 40C.

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I don't think this is true of modern ones, although it was certainly the case with the early ones.
More modern refrigerants are not as wide temperature ranging as the banned CFC's were, which does also impose more limited operating temperature ranges on freezers than used to be the case, but this is not because of single thermostat/compressor fridge/freezer designs.
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Andrew Gabriel
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They only thing I'd suggest is to look for cracks in the inside of the fridge that might have let water into the insulation and saturated it, if that is the case then its pretty terminal in my experience. Brian
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