Do I have a faulty thermostat?

[dan_2386658372]

I’m wondering if a faulty thermostat is what is causing my fridge freezer to misbehave? The fridge gets down to 12C, and the freezer to -20C or so, then the compressor does nothing for hours and it comes back up to ambient-ish.

Edit: thermostat is Danfoss 077B3281 B62 -20.0 -34.0, fridge is Hotpoint RFA52

I have taken the thermostat out to test continuity (results as follows), but not being sure of which pin is doing what, I’ve tested each pin against each other, at ambient and then with an ice block held against the temperature sensing tube.

Does this look like a faulty thermostat to you experts?

Many thanks, Dan

continuity test results: (/ohm, high = out of range)

resistance at ambient, to ground
setting…..pin3……..pin4…….pin6
off…………high……..high……..high
1…………..high……..high……..high
2…………..high……..high……..high
3…………..high……..high……..high
4…………..high……..high……..high
5…………..high……..high……..high

resistance at ambient, to pin 3
setting…..pin4……..pin6
off…………0.5………high
1…………..0.5………0.5
2…………..0.5………0.5
3…………..0.5………0.5
4…………..0.5………0.5
5…………..0.5………0.5

resistance at ambient, to pin 4
setting…..pin6
off……………high
1…………….0.5
2…………….0.5
3…………….0.5
4…………….0.5
5…………….0.5

All results were the same when the temperature sensing tube was held against an ice block as well!

[Tony R]

Re: Do I have a faulty thermostat?

Dan, the thermostat is just an automatic on/off device, a resistance test is pointless.
The stat, if fitted in the fridge, will cut out after the fridge rear wall has reached a certain temperature, and cuts back in shortly after the frost on the rear wall has melted.
It does sound as if the stat is faulty, as it should cut in around 5-7 degrees.

[Author]

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