Fridge Temperature

[Kmcg1970]

Right, fridge freezer.
Noticed on new years day that fridge was too cold, freezing up.
Turned dial down, but only ‘switched off’ when turned to zero.
So I was left with 2 settings: off, or too cold (no matter what number above zero I set the dial to).
Got to be the thermostat I thought.
Ordered part, went fridgeless for 6 days and fitted about an hour ago, still the same issue by the look of it
What else could it be? ‍♂️
TIA

[electrofix]

before anyone can make an informed opinion we would need a make and model number

and the part you changed we need to know what it was and part no

Dave

[Kmcg1970]

Thanks for the reply.
Ceta fridge freezer.
No manual. Barcode sticker within fridge section: A320600CA13052036.
Complete thermostat part located within fridge ceiling light fitting replaced.
Guessing what was in place was manufacturer spec.
WDF20T-100-024
D1303P1B1
​​​​​
Replaced with as like for like as I could find via supplier.
Neither old nor new would ‘click off’ even after being set at highest setting for a period, then turning down. Unless turned to zero, then switches off completely.
As if thermostat is not recognising the temperature and fridge stays on continually.
Tried to upload photo, but exceeded upload limit.
Hope this helps. Cheers

[electrofix]

photos can be hosted elswhere like google pics then post a public link

how did you fit stat, assume you did not cut the sensor as i have had people do that

Dave

[kwatt]

That’d be a Cata I suspect, Chinese thing rebadged basically and the stat number would certainly point to that.

I will try to explain but to people without a working knowledge of refrigeration this may not make a heap of sense or might not but I’ll try.

Over freezing to below temp is classic, slam dunk, it’s a thermostat or sensor problem and most people will jump to that conclusion but, on rare occasions and unless you know what to look for which is more familiarity with the cabinet, gut instinct or experience thing than much else, it’s not. On electronic controlled and/or fan driven machines, more complex but this one isn’t that with that stat in it.

So, if it’s not the stat the other reason can be a refrigerant system problem.

What can happen is the evaporator chills but the compressor isn’t pumping well enough to allow the gas (freezy bit of the evap) reach the end of the thermostat phial where the surface temp is detected by the thermostat. So, the thermostat (it’s dumb, but whatever) doesn’t get cold enough and the message to shut off the compressor. So the compressor keeps on a-runnin’ and you get over freezing problems even though the stat is working perfectly well.

The evap gets cold and you can sometimes get a hulking great block of ice on one section, frozen milk, tomatoes like cannonballs yet it keeps on cooling because that one area it needs to get cold, isn’t. But, it’s not always as obvious as that.

Where you see ice formation across a section of the evaporator (behind the wall or not, makes no odds) but not over it completely as it ought to be, there’s a refrigerant system problem, not a control one.

Hope that helps.

K.

[Kmcg1970]

Thermostat had 4 spade connections: earth, white, brown and black.
By sensor you mean the wire probe type part? (excuse my ignorance)
Removed that from the cavity without detaching from the main thermostat unit.
Feels like the problem is defo not with the stat.
I’m guessing kwatt is along the right lines.
I’ll get a man to have a look and see what’s what.
Thanks for the help guys.

[Author]

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