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Our Bosch larder fridge stopped cooling recently. In view of the price of a new fridge we decided to have the compressor replaced (£140). The engineer told that the original compressor used a refridgerant similar to calor gas and he replaced it with one using a better (more common) gas.
All was well for 2 days but then the fridge made some strange noises and stopped cooling again.
Eventually the engineer turned up again and decided that the circuit board had failed. In view of the cost of the Bosch item he removed it altogether and replaced it with a simple universal thermostat. This is a less neat solution because the sender and lead are visible inside the fridge, but at least the fridge now gets cold again.
However, the fridge is now running too cold and the food inside freezes. The thermostat is set at the minimum level, so clearly something is wrong.
At the moment the engineer is not returning my phone messages!Any comments or suggestions would be most welcome.
Re: Compressor replaced but still have problems. Opinions pl
The engineer has just called me back and is coming to look at it today.
He suggests that it needs a thermostat with a longer capillary tube so that it can me mounted higher up inside the fridge.
Sounds plausible to me, so hopefully that will solve the problem.Re: Compressor replaced but still have problems. Opinions pl
Ehm…
I hate to say it Mike but this doesn’t sound right.
The “Calor” type gas that is referred to is R600a which is the most current type of gas being used.
You can convert in some cases, but not all. If I recall correctly, you can go from R134a (older gas) to R600a but not the other way around.
As for changing from electronic to thermostatic control, I’d never attempt that and I doubt many others would either.
HTH
K.
Re: Compressor replaced but still have problems. Opinions pl
Have changed from electronic to mechanical stat on occasions but thats only when the fridge/compressor is running correctly to avoid shelling out £140ish on control units when a mechanical can be fitted for £75ish,always been on larger capacity larder fridges 8 cuft plus.
Wouldn’t change gas over myself,if the machine was designed to run on 600a then putting another type of compressor and different gas in then the capillary/metering tube may not be the correct length to give correct pressure at evaporator to obtain optimum refrigeration.
Why would you do that ?it just complicates a straight forward repair.
Sorry but your in a bit of a hole,lets hope he can work wonders.
Let us know the outcome.Re: Compressor replaced but still have problems. Opinions pl
The engineer came back on Friday and fitted a thermostat with a longer tube, thereby enabling him to fit the sensor at a higher position inside the fridge. Unfortunately the fridge is still running too cold.
Was he right to raise the position of the sensor? It seems to me that raising it to a warmer part of the fridge would have the opposite effect! Surely lowering it would make the compressor cut out earlier? I’m confused!
kwatt and spimps. Yes, he changed the original Danfoss compressor running on R600a for another Danfoss one running on R134a. He told us the reason was that R134a was a much better gas. I took “better” to mean more efficient. Out of interest, would a compressor for R600a cost the same as a compressor for R134a?
Re: Compressor replaced but still have problems. Opinions pl
Hi
R600a compressors at the moment are cheaper than R134a compressors.
r600a is more effecient than R134a and also cleaner and less supseptible to restrictions.
Bryan
Re: Compressor replaced but still have problems. Opinions pl
Bryan. Thanks for your reply.
If R600a is more efficient than R134a and the compressors are similarly priced, have you any idea why the engineer should have wanted to switch?
Also can you answer my other question – would raising the postion of the thermostat sensor make the fridge run warmer or cooler?
MikeRe: Compressor replaced but still have problems. Opinions pl
Hi
Its possible that the engineer was’nt qualified or comfortable with working with R600a.
Changing from any electronic to standard stat in my opinion is a no no.raising the ne capillary fixing higher would make it run colder if its away from the evaperator.if he’s screwed it into the evaperator he has been lucky not to have punctured it which would make it un repairable.
bryan
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