The temperature seems to overshoot and then it sounds like a relay is oscillating at between 1sec and 1/2 sec . Then it can settle down again and control the temp. The freezer has been defrosted to ensure the sensor is clear. Is it a control board fault & is it repairable, or likely to be uneconomic?
I had the same problem last year and changed the miniature relay - £3.50 from Maplin. That cleared the problem for 18 months until a couple of weeks ago when the clicking started again. So I changed the relay once more but this time it hasn't cleared the problem. So looking at £146 for new control board from Whirlpool.
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work should be performed by a qualified service technician. verify that there is proper voltage at the wall outlet using a voltage meter. if it is ok check for voltage to the compressor relay. if it is ok unplug the freezer and check for continuity at the start relay and overload. if it is open you have a relay or overload. if it is ok check for the ohms rating at the compressor. common to start/common to run, start to run should be the total of both. also start/run to ground if any of these are open you have a system problem.
Is it coming from inside the freezer or outside? If outside either the auto defrost timer is a problem. If the noise comes from the compressor, almost certainly the starter relay inside the electrical cover needs to be replaced. It can be purchased at most refrigeration outlets. If coming from inside, you need to defrost the freezer properly for 12 hours then restart. The noise should go away then.
You Said, I have a Whirlpool upright freezer AFG 371/H there is a digital display
and lights and buttons, on/off temp alarm etc running across the top of
the freezer. None of this works but the freezer is still freezing. i
have no idea what the temp is.
I think you should try unplugging it for 5 minutes and then try restarting it and see if it reset.
The orange button is the "turbo boost" - for reduzing the temperature the fast way. Mostly used when first time use or you put in a lot of unfrozen things at once. When reaching optimal temperture it goes off automatically. The red one is the alert button. Not sure about the green one. Under normal conditions none of the lights is on.