Electrolux F/F problem Thermostat Ranco K59

[spike020147]

Hi everyone

Thanks for letting me join your Forum .

I have a problem with my Electrolux Fridge Freezer Model 7946B , at first the temp in the Fridge was getting high at times up to (9C) then for awile it would be ok down to around 2C .
So I purchased a new Thermostat Ranco K59( chinese I think ) and fit it , but then the F/F would not switch of, the fridge was going down to -4 .
So I fit a timer for the time being to switch on for 1 hour and then of for 20min , that was keeping the Fridge to around 0C/3C .
I then ordered a Original RANCO Thermostat , fit that and it is still the same ,the fridge is getting down to -3C and still not switching of.

Fitting the Thermostat was quite straight forward , the Capillery tube just went straight into the Fridge from the top then behind the Evaporator plate and looped around a plastic clip at the back of the plate then a screw pulled it up to the back of the plate , the clip kept the tube about 1/2 mm Wy from touching the plate .

It has got me beat , I did serve my time has a Electrician ( albeit a long time ago ) so I have got a bit of savvy .

spike

[kwatt]

Re: Electrolux F/F problem Thermostat Ranco K59

Can’t find that model on Electrolux’s system. 😕

Is it a single stat, single compressor model?

K.

[jongriffin]

Re: Electrolux F/F problem Thermostat Ranco K59

hi
if its not stat it more than likely is short of gas.
Engineer time.

[don]

Re: Electrolux F/F problem Thermostat Ranco K59

It’s an old one K circa 1999 I found it on Lux’s system by searching shortcode ie ER79 and scrolling through till I found it.

Anyway details are ER7946B PNC 924628058. Thermostat still listed by E.Lux which appears to be genuine only, no pattern part that I can find so maybe the one the fitted is not correct.

Dave in the shop should be able to get the genuine one for you spares@ukwhitegoods.co.uk in you wish to order.

Don

[spike020147]

Re: Electrolux F/F problem Thermostat Ranco K59

Hi Guys

Thanks for the replies , already asked Dave and he said, Quote “2113378018 is the original part number but you can replace that with a universal VT9 ” which is what I have fitted .

The Fridge and Freezer work fine when the comp is running , so I can’t see how it can be short of gas ! .

cheers

spike

[kwatt]

Re: Electrolux F/F problem Thermostat Ranco K59

The compressor could well be short cycling or stalling.

K.

[jongriffin]

Re: Electrolux F/F problem Thermostat Ranco K59

if the gas doesnt reach capillary it will get too cold and run a lot.

[spike020147]

Re: Electrolux F/F problem Thermostat Ranco K59

Hi Guys

Thanks for all your feedback , in answer to Kwatt ” The compressor could well be short cycling or stalling” . the compressor is runing all the time can here it and the Evaporator in the fridge is frozen over so there is no problem with the Comppressor ! .

In anwer to jongriffin ” if the gas doesnt reach capillary it will get too cold and run a lot” , Not sure what you are saying ! , what gas to what capillary .

cheers

spike

[admin]

Re: Electrolux F/F problem Thermostat Ranco K59

Hi

Yes a VT9 will fit as long as it is wired correctly. There would be NO fault on the compressor and it’s NOT low on refrigerant as the fridge is going to -4 as the refrigerant goes round the freezer section first and as yo haven’t mentioned the freezer temperature I can only assume that this isn’t a problem.

Bryan

[kwatt]

Re: Electrolux F/F problem Thermostat Ranco K59

Uhm, if the compressor isn’t pumping correctly then it can indeed run continually and give the symptom described. Quite probably as the internal seals are degraded and it’s running SOG internally, this is not entirely uncommon on older machines as the seals in the compressor fail through wear and tear or simply rot through age.

Given it’s a sealed system, any leak, even if it doesn’t allow refrigerant to escape to atmosphere, will cause the machine to either overrun but not cool correctly, usually in the fridge and the freezer will stabilise first or short cycle. As in, the refrigerant cycle isn’t right or completed.

If the compressor runs constantly and all else is okay, that’s the most likely cause.

The machine should “cycle” through on and off as the thermostat reaches the cut in and cut out temperatures. Should that not happen then, for some reason those points are not being reached.

Or…

As Bryan correctly points out, assuming that the stat has been correctly wired then the only real possibility in a “standard” non-frost free and non-electronic unit is the above for what you’ve described as the fault.

You only have two things to choose from, the thermostat which we have to assume is okay from what you’ve said and operating under the presumption that it’s been correctly installed and wired or, it’s the compressor.

Not really a lot more to choose from with the information to hand.

K.

[SAMURI]

Re: Electrolux F/F problem Thermostat Ranco K59

Make sure you check the power is off before checking or swopping any wiring.

To check if you have wired the themostat correctly the black wire is for the compressor this fits on the number 4 connection on the stat. The green goes on the earth connection.

The lamp wire normaly fits on number 6 pin and the live to number 3 pin.

If you turn the power off at the mains, leave it for 10 to 15 mins for the pressure to drop, so the compressor can start again.

Then turn the thermostat off Number 0 setting, then turn the mains on and check to see if the compressor is running.

If the compressor is not running then it is wired ok, now turn the stat on to any setting to see if the compressor is running, if it is running then the stat is ok.

If the compressor was running when it was set on Number 0 Setting then you will need to swop the wires going to 6 And 3, The wire going to six will go to 3 and the wire on 3 will go to 6.

Wait the 10 to 15 minutes again. then check to see if the compressor is off when the mains is turned on and the stat is on 0. If it is then turn the stat back on to the desired setting and the compressor should run.

If you still have a problem with the temperature then it will be the compressor or gas.

Bob

[spike020147]

Re: Electrolux F/F problem Thermostat Ranco K59

Hi

Thanks for all the posts that have been given on here , in answere to SAMURI , I dont have a problem with the Temps , as I said before the Fridge is going down to -4 and the Freezer down to -32 .

The problem I have is that it is not switching off , as I have already said before I did serve my time as a electrician and yes it is wired correctly ( attached drawing ) 6 Live feed with switch of on Knob ( past 0 anti-clock on dial ) 4 to Compressor ( this is the switched feed from 6 ) 3 is common to 6 , this gives a live feed to a line heater that is in a sleeve with the Capilary tube outside the fridge ( this is via the Compressor solanoid contact switch when the Comp is stopped ).

The capillary is atched to the back of the evaporator with a plastic clip which keeps the tube from actualy touching the plate , I was thinking if I alter the clip so that the tube will be in contact with the plate , would this help ! .

I am a person that if something can be fixed I will have a go before taking it to the council dump , it must be the Fitter/Electrcian in me , I have it on a timer at the moment as I have said before and it is working perfectly , so there must be a fix for this ( you could say well leave it on the timer ) well that maybe the answer in the end .

Anyway guys thanks for all your help .

spike

[spike020147]

Re: Electrolux F/F problem Thermostat Ranco K59

Hi Guys

Just thought that I would come back to tell you all that my F/F is now working OK , what I did was mess about with the settings on the VT9/K59 Thermo , I used my old one to see what screw ( x2 ) did what , it was the screw on the outside that raised and lowered the plate inside that operated the contacts .

I ended up turning it clockwise ( which brings the plate away from the contacts ) one full turn when the fridge was at 1C it then switched off ( yes I did get a kick when the back of my hand touched the live feed to the power neon light ) .

When the Fridge got to around 5.3C it kicked in again , then of again at 1.1C , Freezer maintained a temp of -22C to -23 .

so there will not be one F/F going to the tip earlier than it should .

Once again I can’t thank all you Guys enough for all the help/feedback I have had on this Forum .

cheers and thanks again

spike

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