Bosch Fridge freezer – KGV-2604-GB/05

[grooster]

Hi,

I’ve just been out to the above mentioned fridge freezer. Its freezing the freezer up fine but the fridge isnt cooling. Its the pcb control panel machine. I’ve not had many dealings with this version before, but think its probably going to be the pcb.
I’ve tried ringing Bosch technical advice, like i have done in the past for various problems, but hav been told today that they will only deal with their service agents.

After looking through a few similar questions on the forum it appears theres some sort of modification to disable the thermistor which isnt swappable. Is this right? Is this going to be the cure or is it more likely its going to be the pcb.

Any help would be greatfully received.

Cheers

Nick

[roly16]

Re: Bosch Fridge freezer – KGV-2604-GB/05

I think I’m correct in saying [but stand to be corrected if necessary] that the modification involves bypassing the foamed-in fridge thermistor when it has become waterlogged or faulty]. The symptom of this is that the whole appliance shuts off when down to temp and doesn’t come back on again until it’s switched off at the mains and switched back on again, when the process repeats itself.
Your problem doesn’t sound like that as there’s only one refrigeration circuit. If the compressor’s running and the freezer’s at the correct temp but the fridge is warm it sounds to me like a system fault [short of refrigerant or inefficient compressor. But one of guys with more experience of these may have a better idea.
geoff

[gegsy]

Re: Bosch Fridge freezer – KGV-2604-GB/05

Hi Geoff
Correct Geoff, will shut it all down.
I would be looking at PCB or thermister then.
Greg

[grooster]

Re: Bosch Fridge freezer – KGV-2604-GB/05

Thanks for the reply Roly. I thought the same about loss of gas or faulty compressor but with this the compressor usually gets very warm. It was cold to touch as though it hadnt been on for quite a while. About 5 minutes into my visit the machine kicked in and started pumping, but not in the fridge. Customer mentioned this is the norm.

[roly16]

Re: Bosch Fridge freezer – KGV-2604-GB/05

When you do the mod you cut out the fridge thermistor and the compressor & the whole system is controlled by the freezer thermistor only, but it all still works ok. Assuming the gas enters the freezer evaporator first, if there wasn’t enough gas to cool the fridge this wouldn’t get detected as the fridge thermistor has been disconnected. The compressor would get hot if it was running all the time, but if it’s being controlled by the freezer thermistor which isn’t faulty it’ll switch on & off as normal provided there’s enough gas to cool the freezer properly. I still think that’s your problem. Hoping this is clear; I don’t think I,ve explained it very well.

[sparkey]

Re: Bosch Fridge freezer – KGV-2604-GB/05

Both sensors are in the refrigerator section, one is for air temperature control the other (the one that fails) is for fridge evaporator defrost temperature control, hence when it fails the control module will not turn the compressor on.

There is no control whatsoever on the freezer temperature, it has been calculated in the design that when the fridge is at +5 the temperature in freezer should be minimum of -18.

This appliance must be installed in a room temperature of at least +12 or that can also give problems with compressor run times.

There has been much discussion about the sensor bypass in other postings in this forum, use the search facility to find it

Regards
Sparkey

[grooster]

Re: Bosch Fridge freezer – KGV-2604-GB/05

The bypass mod has been ordered and i’ll let you know how i get on in the next couple of days.

Cheers

Nick

[roly16]

Re: Bosch Fridge freezer – KGV-2604-GB/05

Thanks for the correct information about the thermistors sparkey. This begs the question “If there’s no temp control in the freezer, what’s switching the compressor on/off if the fridge isn’t cooling? Is it just switching off on defrost? In which case you’d expect the compressor to be hotter.
geoff

[grooster]

Re: Bosch Fridge freezer – KGV-2604-GB/05

Hi,

Just to update you. I fitted the modification (cant believe they charge £13 for whats basically a bullet connector and a print out, but thats by the by). Its worked fine, thanks for all your help.

Nick

[Author]

Posts