Liebherr SBSes 7273 – Freezer not cooling

[Hippo4s]

Hi folks I wondered if anyone had come across this problem and had an answer.

Liebherr SBSes 7273, Age Dec 2009, Service no:0981368-01
Freezer problem started with the digital sensor changing from -18 to -12/-10/-5 and the warning sound activating.Prior to this the appliance has been superb for 4 years.
I naturally checked the door was closed properly.
I switched the power off/on and it seemed to correct itself for about 24 hours, but same problem came back. I put a thermostat inside the freezer which was showing -15 but digital external display was showing -5. I then took all food out and defrosted the freezer, although it is frost free. After about 8 hours I cleaned inside and put freezer on turbo freeze with no goods inside, It has only got back to -10 in 24 hours whilst empty. When i switch the fridge off/on I can here a compressor kicking in but not when i do the same with the freezer side, I can here a much quieter noise. I opened the door and the noise is the same, so I presume this is the compressor. I cannot here a fan with the door shut. Ventilation for this appliance is as per the Liebherr instructions. I have ice in the ice box, temperature is dropping just not as quick as I believe it should. Does this point to the freezer fan? I also don’t no where the temperature sensors are located.

Any help/advice would be greatly appreciated.

[admin]

Re: Liebherr SBSes 7273 – Freezer not cooling

Hi

How many times does it beep ? there will be a pause at some point. beep beep pause beep beep pause ect. dependent on the count of beeps will give a fault code.

Bryan

[ELDAR59]

Re: Liebherr SBSes 7273 – Freezer not cooling

Hello, the temperatures that you’re reporting are what you would expect if the freezer evaporator fan wasn’t running.
This could be attributed to the fan itself, sensor or pcb.
The evaporator sensor is located at the bottom of the evaporator.
also try not to switch the appliances off and on, you could cause damage to the motors doing this.

[Hippo4s]

Re: Liebherr SBSes 7273 – Freezer not cooling

Hi Bryan thanks for the reply, I am unable to count the beeps, as the highest I can set the freezer is -14 and display has not shown lower than -9, so wont beep anymore. Inside measured temperature at the top is around -14 and -18 at the bottom.

[Hippo4s]

Re: Liebherr SBSes 7273 – Freezer not cooling

Hi Eldar59 thanks for the reply, can you tell me where the evaporator and fan are located? I presume I need to get to the rear of the freezer. Are either the fan or evaporator sensor parts I could replace? (I am from an electrical background)

[ELDAR59]

Re: Liebherr SBSes 7273 – Freezer not cooling

hello there, the evaporator is in the top of your freezer and is very accessible.
two clips either side of it pull out, allowing the evaporator to swing down partially. taking off the polystyrene top gives access to all the components you have in there.
sensors are located at the front and also in the body of the evaporator.

[Hippo4s]

Re: Liebherr SBSes 7273 – Freezer not cooling

Hello Bryan, the freezer starting beeping today, display showing -10 and inside also -10 (set at -18) inside has been -15 to -18.
4 beeps pause 4 beeps pause etc.
Thanks

[Hippo4s]

Re: Liebherr SBSes 7273 – Freezer not cooling

Hello Eldar59, thanks for the info, I will have a look at the weekend.

[ELDAR59]

Re: Liebherr SBSes 7273 – Freezer not cooling

Your appliance has two audible alarms. Three beeps and four beeps. Three means the door is open, four means that the temperature isn’t correct, ie too warm.
Error codes are visual and only apply to the sensors. A faulty sensor however, won’t always throw up an error code.

[Hippo4s]

Re: Liebherr SBSes 7273 – Freezer not cooling

Hello Eldar59,
After lots of hassle from the better half I got around to looking at the freezer. I unplugged the fan and connecting 230v direct and it works fine. I saw 2 sensors, (1) white tubular 30x8mm which I presume is the fan sensor. I am going to track this and short out to see if fan comes on, if so will order and replace. (2) brown 26x20x6 fixed to the plate above the evaporator, marked IRCA 93 deg 05 09 can you tell me what this is and purpose.

Also when I pulled fridge/freezer out the freezer compressor very hot compared to fridge compressor. Not too hot to touch, I presume this is to be expected as it is never reaching temperature and not getting a rest. Could this leave long term damage to the compressor?

Kind regards,

[ELDAR59]

Re: Liebherr SBSes 7273 – Freezer not cooling

Hello, don’t short the sensor, or you’ll be replacing the pcb as well!
The other part you talk about will be the thermal fuse and you should have continuity through this.
I don’t have access to technical pages this weekend and so I can’t look at the appliance more closely. You’ve proved that the fan works, you’ve just got to attribute the fault to either the control of the fan, ie sensor and possible pcb, a system fault or maybe even a defrost circuit fault.
Is the evaporator iced up?

[Hippo4s]

Re: Liebherr SBSes 7273 – Freezer not cooling

Hello Eldar59, once again thanks for your advice. The evaporator was iced up but not badly, I could see ice at the front for the first time before I opened this up to get to the fan. The brown item does not look like a fuse, it has a blue and red wire, blue connecting to the fan 4 core going down and red connecting to a pipe off the evaporator board. So it must be some sort of temperature sensor for the evaporator pipe work. Does this Freezer have a defrost circuit, Its a frost free freezer, I have never defrosted it in 4 years. Or is it something that happens without me knowing. How can I prove the sensor is good or faulty? If I measure ohms across the sensor what should I expect?
Kind regards

[ELDAR59]

Re: Liebherr SBSes 7273 – Freezer not cooling

Hello, as I said I don’t have access to tech info this weekend. The freezer does have a defrost circuit which employs a heater to periodically defrost the evaporator.
I’m thinking that this isn’t a simple straight forward issue and maybe you’ll be better calling for an engineer.
I’ll look at it again when I’m in the office after the weekend and see if I can shed any more light on it for you.

[Hippo4s]

Re: Liebherr SBSes 7273 – Freezer not cooling

Hello Eldar59, I realise you don’t have your tech books at home and I don’t blame you. However your guess on the fuse was correct as I have just found a service book online, not for my model but very similar. It clearly shows the brown item as A temperature fuse. I saw fan operates when sensor has correct value colder than air sensor, door reed switch is closed and compressor is on. So that limits it to evaporator sensor or reed switch, if neither of those then the control PCB. I don’t believe the PCB is faulty as everything else is functioning correctly. Many thanks once again.

[ELDAR59]

Re: Liebherr SBSes 7273 – Freezer not cooling

Hello, it wasn’t a guess re the fuse, it’s what we do!
I’m actually away this weekend, but still looking in on the site. It won’t be the reed switch, faults with these are very rare.

[Author]

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