[PClem]

Hi,
Just an update on a couple of symptoms experienced with this ongoing issue of intermittent freezer temperature alarm without any explanation.
When the freezer alarm sounds (4 beeps) if you do not cancel it by pressing the flashing red alarm button it stops after 30 minutes and unit eventually returns to normal operation.
If the fridge door is left slightly open with light off alarm (3 beeps) never sounds?
If opened further to bring on light alarm sounds correctly after 60 seconds.
Freezer door is left slightly open similar to fridge door alarm never sounds.
Would appear that door open system alarm relates only to operation of relevant reed switch and nothing to do with temperature of either compartment.

Any comments welcome.
[h=2][/h]

[PClem]

Hi Rien,

Unfortunately I have nothing positive to update you with following my actions previously reported.
I am lost for ideas to resolve this frustrating problem now as the component parts test out OK.
I fail to understand why the freezer alarm sounds at various different high temperatures and other times works fine.
Was hoping that an experienced engineer on this forum might be able offer some logical explanation.

Good luck with your freezer and please let me know if you have any ideas or come across a solution elsewhere.
Regards
Pete

[PClem]

Hi Tony,
Replaced the

evaporator sensor in the fridge as advised.
All seemed to be OK but unfortunately after 3 days freezer alarm sounded at -7.5C.
Cancelled alarm and pressed SF button, compressor started up after 9 minutes.
Would appreciate any further advice you could offer as possible solution.
Regards Pete

[PClem]

Thanks Tony R,
I will order a sensor as you suggest.
Do you know if the 3 thermistor sensors are the same. When I replaced the Freezer evaporator one it had a value of 4.7Kohms.
Also could you please advise location of fridge evaporator sensor. I know it is the green connector on the control board but so far have only located the fridge air sensor behind the lamp cover housing.
Thanks again
Pete

[PClem]

Hi Tony R,
Freezer alarm sounded at -6.9C.
Whilst feeling the compressor, which was between cold and slightly warm to the touch, it suddenly started up!
Next I didn’t cancel the alarm and pressed SuperFrost on.
Within a couple of minutes alarm stopped and temp quickly restored to normal level.
Should I leave in SF mode?

Will repeat test next time alarm sounds and hope to switch on SF mode before compressor starts up.
Unless of course you instruct me otherwise.

Thanks for you help
Pete

[PClem]

Thanks Tony R,
No I have not tried your suggestion so far.
Should I wait for the freezer alarm to sound before trying to run in SF mode or just in normal operation.
I take it I should note temperature at the time and then again after several hours of running in SF mode.
I there a fixed time you would suggest ?

[PClem]

Re: Liebherr CUN3033 Freezer not cold enough

Thanks Tony R,

I have checked that the defrost water exits down the drain hole at the bottom of the evaporator unit in the freezer section. Can you tell me how to locate the drain valve. Will I have to pull out the fridge freezer to access this form the rear.
Thanks
Pete

[PClem]

Re: Liebherr CUN3033 Freezer not cold enough

Hi,

Unfortunately after approx. 6 weeks it looks like my original problem is back with the Freezer only going down to a temperature of -12C. However when I removed the back panel the ice build up on the evaporator is nowhere near as bad as last time.
I removed the 2 pin connector to the defrost circuit and checked the circuit which appears to have a continuous reading of 386 ohms. Am I right in thinking this circuit is made up of a heater and the thermal semiconductor mounted on the front (markings: IRCA M G5 TL11 86C)of the evaporator unit. I both heated this with a hairdryer and freezer spray but the reading never changed.
Any suggestions would be much appreciated.
Thanks
Pete

[PClem]

Re: Liebherr CUN3033 Freezer not cold enough

Thanks ELDAR59,
Your diagnosis was spot on, there was a build up of ice on the evaporator.
I have defrosted the unit and normal operation appears to have been restored with the fan operation confirmed.
If the problem should return should I start fault finding by checking continuity of the defrost heater circuit. This appears to include a thermal switch on the front of the evaporator unit, visible through a cut out in the polystyrene front cover.

Thanks again for your assistance
Regards
Pete

[Author]

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