Liebherrr KlPe 1740 fridge out of control

[23dash]

Re: Liebherrr KlPe 1740 fridge out of control

Guys…

Liebherr 6151028 thermostat is on back-order (3 weeks) with no stock in the country as far as I can ascertain (after many enquiries this morning).

I have located a Ranco K57 thermostat which is claimed to be compatible. Would you agree? Less than half the price of the Liebherr original.

Dave

[ELDAR59]

Re: Liebherrr KlPe 1740 fridge out of control

Hi dave, I wouldn’t attempt to fit a stat other than the original one on this model. The critical thing here is length of capillary tube. The position of the bulb at the end of the capillary tube, in relation to the evaporator is all important and the original stat will have just exactly the right length of tube so that the bulb sits in the sleeve at the bottom of the evaporator.
Hope that helps.

[23dash]

Re: Liebherrr KlPe 1740 fridge out of control

Unfortunately I can’t wait 3 weeks for a Liebherr part. The Ranco part is suffixed with same part no. as the original part and has 1850mm long capillary, so hopefully this will be a fit.

The fridge is currently being run on supercool to keep contents cool and my temp probe has shown as cold as -5degC. Does supercool also rely on feedback from the capillary bulb for control or is there another feedback system?

Dave

[ELDAR59]

Re: Liebherrr KlPe 1740 fridge out of control

hello, it can’t rely on the thermostat, because we already know that the stat is broken.
if I remember correctly, there is an air sensor on this model, located in the lamp housing. this and the pcb, will keep the appliance at 2c.

[23dash]

Re: Liebherrr KlPe 1740 fridge out of control

If I’m seeing -5degC on my electronic thermometer when supercool is selected does that possibly suggest a pcb issue?

The pump does switch off after around 30mins, so it is receiving a signal from somewhere, however it doesn’t switch on again (during its 6 hour time cycle) and temp then continues to rise up beyond 9degC

Throughout all of the above, the temp readout on the fridge display is showing 2degC constantly (where does this get its info from, the thermostat or the air sensor?)

Dave

[ELDAR59]

Re: Liebherrr KlPe 1740 fridge out of control

hi dave, it depends where you’re measuring.
F0 means you have a thermostat fault, this is confirmed when you select supercool and the compressor runs.
the stat is the place to start at, let’s not over complicate things.
it could possibly be that you have other issues (this would be rare) but you need to change the stat first.

[23dash]

Re: Liebherrr KlPe 1740 fridge out of control

Thanks Eldar59

Will do. Stat should arrive today/tomorrow. 1850mm long capillary seems plenty of length to reach bottom of evaporator panel.

Fingers crossed !!

Dave

[23dash]

Re: Liebherrr KlPe 1740 fridge out of control

New stat fitted. Fridge working again (running on/off between 7.5degC and 2.5degC according to electronic thermometer placed about 1/3 up from bottom of fridge).

Back to some kind of normality !!

Temp gauge in fridge currently showing constant 6 degC (as with previous stat when it was functioning). Setting dial on stat currently set 3/4 fully clockwise (as previously).

I did notice that the digital temp indicator on the control panel took around 2 hrs to drop from 9 to 6 degC despite the fridge having cycled at least 10 times (and electronic thermometer having been displaying average of 5 degC for most of that time).

Dave

[ELDAR59]

Re: Liebherrr KlPe 1740 fridge out of control

I’d keep my eye on it for a while.
I’m still not convinced about the replacement stat. Time will tell.

[23dash]

Re: Liebherrr KlPe 1740 fridge out of control

Two days on and seems to have settled down now that fridge body and food have chilled. Compressor is switching on at 5.5degC and off at 3 degC.

Temp display in fridge has now settled at 4 degC

Looking good 😉 fingers crossed

Dave

[ELDAR59]

Re: Liebherrr KlPe 1740 fridge out of control

Thanks for the update Dave, It’s good to know that we actually win sometimes!
Cheers.

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