[ChilliWilli]

Re: Hoover HNMF 2805A L80 – frozen fridge problem!

helo_75, et al,

You were spot on with your diagnosis technique! I hooked up my multimeter to the ends of the defrost sensor and could only get one reading of varing resistance with temperature.

I measured at the terminals that enter the PCB. There are two sets of 2 wires for this FF. See below for picture.

One pair in blue and one pair in white. I could only get a reading from the blue pair. So I guess my FF gets the freezer signal, but not the normal defrost signal and does not go through its proper defrost cycle? I tried cooling the sensor down to freezing with some ice blocks but nothing on the multimeter. Is this a good enough test?

So if this is a sucessful diagnosis of the problem….. If this sensor is all foamed in, can I buy a new sensor, snip out the old one, splice in a new one in the freezer section (where it normally lives), and use something like a hot glue gun to make the splice water/ice proof to lessen the hassel of replacing the faulty sensor? Maybe someone can/needs to PM me and discuss this offline to preserve professionality?

Cheers all,

Willi

[ChilliWilli]

Re: Hoover HNMF 2805A L80 – frozen fridge problem!

Dear UKWHITEGOODS,

I was brave this morning and decided to investigate the PCB and found something interesting! I spotted some scorch marks on the outside of the PCB casing, ignored the “void warranty if opened” message on the plastic cover and found a couple of black heat marks that were exactly opposite some surface mounted resitors (104 ohms). These are part of the circuit that feed into the temerature sensor.

The resistance accross them still adds to there printed value and the circuit continues to conduct, so as far as I can tell the PCB is still intact; it just appears to have got a little hot at some time.

Is there anyway I can test the temperature sensor to see if this has been damaged? Is this a PCB issue or a temerature sensor issue, or both?And is there anyway that I can try a slution out before paying for a brand new PCB only to find out it was the sensor?

Thanks again all.
Willi

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[ChilliWilli]

Re: Hoover HNMF 2805A L80 – frozen fridge problem!

helo_75,

Thanks for the reply. I am fairly competent with most DIY jobs and can take most things apart and put back together again without any hassle. Regarding use of a multimeter, as long as I know what I am looking for I can use one and diagnose problems with one. I have a fairly decent one too which will test mains rated appliances (700VAC, 10A). If you can point me in the right direction that would be great.

Some recent observations: – I did find on the rear of the fridge-freezer, roughly at the height of the middle of the fridge section, a block of ice that was forming on the outside, where the plastic insulation and the silver/aluminium coloured plastic cladding of the outside of the fridge meet. That is down one long edge of the FF. It was not touching the radiating bars. I hope that makes sense.

Could it be that the temperature sensor has been inadvertently been moved out of position by being expanded out of its original location through the ice formation? Just an idea.

Thanks again for checking my post out.
Willi.

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