Liebherr 7082 defrost cycle drainage issue

[BrianFWombat]

Re: Liebherr 7082 defrost cycle drainage issue

>>> The fridge evaporator sensor on a liebherr can sometimes fail due to water leaking into the sensor.

Interesting. Is the evaporator sensor labelled 260 on the previous diagram? or are there two sensors… one in the interior and one on the evaporator?

Thanks in advance,
BfW

[kwatt]

Re: Liebherr 7082 defrost cycle drainage issue

The new temperature sensor is here, part number 9590142 and the same part is also used as both the fridge and freezer sensor.

In this machine all the sensors used are now the same part number.

HTH

K.

[BrianFWombat]

Re: Liebherr 7082 defrost cycle drainage issue

Following the logic through… there are three thermistors in this appliance… 250, 260 and 270 on the diagram.

250 is the Fridge Air Temperature sensor, 260 is the Fridge Evaporator sensor and 270 is the Freezer Evaporator sensor.

Now… in the fridge compartment… if I measure using two digital probes…

… the Wet-Wall/Evaporator temperature, near 260, it reads -5.2C

… the air temperature, near the location of 250, it reads +7.7C

Under these conditions, in my fridge, the compressor is not running and the fridge interior fan is not running.

Is it safe to conclude that if the air temperature (+7.7) is well above set point (+4.0) then I would expect the fan to be running (and possibly the compressor too), and given that I know both the compressor and the fan are in good order but not currently running I can conclude that it is either a controller fault (unlikely according to previous posts) or that the air sensor (item 250 in diagram) is faulty; i.e. 250 sensor is measuring T in such a way that controller believes SetPoint is already reached?

i.e. 250 Sensor mis-Calibration/non-Linear behaviour?

Thanks
BfW

[BrianFWombat]

Re: Liebherr 7082 defrost cycle drainage issue

Actually, I’ve decided it could be either… (remembering my Eliwell controller manual… the fan is controlled by the evaporator sensor, it runs until the evaporator reaches FSt).

So…IF similar logic applies to the Liebherr logic in CNes3866 the interior fan would be controlled by the evaporator sensor rather than the air sensor…

…the fault could be the evaporator sensor as suggested earlier…

I’ll change Part 260 after my defrost and see if it makes a difference; if not, i’ll swap it for the 250!

Thanks,
BfW

[BrianFWombat]

Re: Liebherr 7082 defrost cycle drainage issue

Have been away for a few days and left the fridge/freezer to defrost completely during that period…

.. returned and measured the Resistances of both thermistors in the fridge compartment… Wet Wall (RED) and Fridge Air (GREEN). Both of these measure around 5k Ohms at 20C and if warmed the resistance decreases or cooled the resistance increases so I conclude they are fine.

Anyway.. turned it back on and the temperatures seem a bit more sensible anyway so I’ll monitor for a while but perhaps the defrost fixed it.

Very Strange.

Regards
BfW

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