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Re: LIEBHERR NOFROST FREEZER
Update; fixed, evaporator sensor. Sent by Liebherr within 24 hours. Many thanks to samuri and Alf Uckem for their assistance.
I was able to fix this by lowering the evaporator module at the top of the freezer; the instructions say the module can be pulled forward but it seems to be restrained by the refrigerant pipes at the back. It there enough slack in the pipes to pull the module forward?
However, some thoughts on this unhappy experience. My previous encounter with thermistors was in BMS systems. One installation I was heavily involved with had 100 or 130 outstations, and those outstations could have just 2 or 3, or up to 40 analogue inputs, which were usually thermistor temperature sensors. There were probably over 1000 thermistors on that site, immersion, duct sensors, wall mounted, outdoor. Now, it’s a long time since I was there, but i don’t recall thermistors failing. I’m sure there must have been a few in 10 years, but I can’t recall any. Humidity sensors, especially the early ones, were fragile. Thermistors lasted forever, but those weren’t operating at -20 or -30.
Having read someinternet posts, the sensors are a common cause of failure. Surely the encapsulation on these must be defective? Why else would they fail?
Then, £30 for a sensor? Is that usual (“trade price”)? A bare thermistor is 50p and £10 or £20 when in a shiney plastic wall-mounting package. There’s no way a bead thermistor should be £30, especially when it is to replace apparently defective components.
Finally, i was thoroughly unimpressed with both the Comet (10 days!) and the Domestic and General fixed price repair services. The latter sent some man who levered bits of the plastic trim off the back, didn’t get access to the PCB and didn’t diagnose the fault. I asked them to repair the damage and they said they’d ring me back; they haven’t. Shabby, incompetent and unprofessional service.
Re: LIEBHERR NOFROST FREEZER
It does, Mr. Uckem. New sensor tomorrow and see what happens. I will report back. Many, many thanks. OT
Re: LIEBHERR NOFROST FREEZER
Update; I got an engineer out to look at it. He got access to the fan and the evaporator and then announced it was either the PCB or the fan, said he’d have to speak to a colleague and left. He said he’d ring me back on Friday to arrange another call. He didn’t.
The occasional crack as he worked on my expensive Liebherr was an ominous sign.
The only reason I hadn’t attempted a fix was that I didn’t know how to get access to the components under the plastic trim, but since he broken those bits for me and it’s scrap if I don’t fix it, I’m now working on it.
The fan works, there’s no power from the PCB. Can anyone advise me what the resistance of the air temperature and evaporator thermistors should be at about 21 degC? I have two very different values, 2.8 & 5.9 kOhms, which seems odd; every control system I’ve come across has used thermistors with the same values. Anyone know what these should be. I will emit waves of gratitude and good karma to anyone who helps, the wife is going to kill me if she doesn’t get a freezer soon.
Re: LIEBHERR NOFROST FREEZER
This has happened again. The freezer ran for about a week and the stopped again. I have now completely defrosted it but it shows no sign of restarting. The internal fan used to run for a few seconds after the door was closed (judging by the sound) but this no longer happens. I can see a part of the evaporator, which gets frost on it, so it looks like the fan has failed or it is being held off for some reason.
Could someone please advise me how I can get access to the fan and the sensors? It is not obvious how to remove the plastic trim without breaking it. I’m an engineer and have much experience with electronic BMS controllers, thermistors and controls for 230 & 415V equipment. Any guidance would be appreciated. Can the Comet repair service be recommended? Thanks for any assistance.
Re: LIEBHERR NOFROST FREEZER
First, thanks for your advice Bob, it is much appreciated.
Secondly, I left the freezer off overnight but didn’t thoroughly defrost it as you’d recommended. There is still too much usable food in it to do that.
I turned it on this morning. The compressor started as usual but the condensor coil remained mostly cold, so there was little heat being shifted. After 5 minutes there was the sound of another motor starting, an internal fan I’d guess; this hadn’t happened previously. The condensor immediately got warm and the freezer started working again. After 7 hours it was at -15 degC, the fan noise had stopped but the compressor still seemed to be running. Setting the temperature down to -17 set the fan running again. There was less than a cup of water in the drain tray above the compressor.
So I was wrong. You were right. Thanks.
I’m quite annoyed about this; I’ve got an expensive freezer that might stop working every 3 or 4 years at random, ruining £100 or £200 worth of food and losing me more time off work. I’m wary of loading it up again in case it stops. I couldn’t get a technician to look at it, presumably because it has electronic controls and is too complex for them. The repairers Liebherr recommended are around the other side of London. Katenutt’s recent post seems very similar. If this is a known problem, why don’t they tell users to defrost it every 3 years or recall them?
Re: Hotpoint 95622 pressure switch wiring
iadom wrote:
However your biggest problem is that the machine you have is between 25 and 27 years old.
Thanks.
1984, a classic collector’s item by now. :D.But it ain’t broke and I’ll keep fixing it until it is. I was reading the post about the ISE v Miele, BTW.
Re: Bosch frost-free freezer, duff compressor?
gegsy wrote:Same as any other TBH, click on link below to find a suitable engineer 😀
Greg
Yes, thanks, that’s what I’d thought. They’d probably assumed it was a PCB type job.
I clicked on the link and filled the form yesterday; no response.
SWMBO informed me today that she’d ordered a Liebherr. £750! Kinell. 😮
Problem solved, I fear.Re: Bosch frost-free freezer, duff compressor?
So are Bosch freezers any more difficult to repair than others, are they difficult/impossible to repair, parts unobtainable, grossly expensive, etc.?
Is it worth repairing?
Re: Bosch frost-free freezer, duff compressor?
gegsy wrote:Could be electronics 😕 Comps are pretty good on these IMHO 😀
Greg
I didn’t think so, ‘cos there’s just a 240V supply to the compressor from the electronics at the top. The 240V remains live + the compressor don’t go = duff compressor. Is there something else I’m unaware of?
