PCB type thermostat compatibility ?

[aneng]

Hi, My niece has a Bush BFFF55152B fridge-freezer that won’t turn off and is in maximum-freeze mode all the time. I’m presuming the thermostat is the likely culprit here. However, it’s not a simple electromechanical bulb type, but a PCB with a microcontroller and miniature relays on.

I haven’t been able to source an identical replacement, but I have found something that looks almost identical visually…

https://goo.gl/vJooa4

This board looks exactly the same with the exception that it has an additional four-pin connector on the right – PL803 – that my niece’s doesn’t have. Her PCB is identical, but it is just missing the four pin header at that point, even though there are holes drilled in the PCB for it.

According to the supplier’s website, my niece’s fridge model is not listed as one of the ‘models this is compatible with’, and no thermostat is even listed against her exact model.

My question is this really; Do you reckon the one I can get is likely to work, or are such things programmed with completely different microcode for each model group and won’t work properly without PL803 being connected ?

Failing that, could I just replace the lot with a basic, standard, thermostat ?

Many thanks,

Kev.

[electrofix]

Re: PCB type thermostat compatibility ?

try

http://www.4ourhouse.co.uk/pcb/product. … BFFF55152b

seems to be listed for your model

BUT this is only the board and not the temperature sensor

Dave

[aneng]

Re: PCB type thermostat compatibility ?

FIFTY QUID!!? That’s extortionate!
Thanks for finding it though. I think I’ll try a cheap standard type in there instead. It’s got to be worth a try to save £45.

[kwatt]

Re: PCB type thermostat compatibility ?

That won’t work without extensive modification and siting the phial exactly right.

K.

[aneng]

Re: PCB type thermostat compatibility ?

I managed to find the correct part at another site, Charles Hyde & Son – £13 plus VAT.

Bit better than fifty ! It makes you wonder how some of these retailers come up with their prices !

[electrofix]

Re: PCB type thermostat compatibility ?

that site is known for very silly prices but they have a lot of contracts and some parts cannot be got anywhere else

Dave

[don]

Re: PCB type thermostat compatibility ?

electrofix wrote:that site is known for very silly prices but they have a lot of contracts and some parts cannot be got anywhere else

Dave

Sadly not for long though. Had a letter from them today to say they will cease trading on 30th November after 50 years of trading.

Aswo will continue to supply parts to existing CH customers.

Another casualty due to the disposable society we live in today 😥

Don

[electrofix]

Re: PCB type thermostat compatibility ?

was talking about connect / 4ourhouse even the retail prices are higher on that site

sad to see CH going but a lot of stuff has gone solid state so cant be repaired gone are the days of tape transport system faults etc that kept firms like CH in work

Dave

[aneng]

Re: PCB type thermostat compatibility ?

I finally managed to fit the new thermostat PCB and…. It’s made no difference! >:-(

The damn thing still freezes everything in the fridge.

I was convinced it was going to fix it.

Where can I go from here?? Might there be a relay on the compressor that could be stuck?

[electrofix]

Re: PCB type thermostat compatibility ?

you have only changed the pcb but the temp is controlled by an NTC which in most fridges is foamed into the case in manufacture. to change it may well involve digging a hole in the insulation and refilling it with foam after. It also need knowledge of where it is to get the new one in the right place
not a job I want to do

Dave

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