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Can anyone help on my problem. I have Zanussi DF62/21 that the freezer compartment defrosts intermitently. The freezer compartment is not getting cold enough despite altering thermostat setting. I have now replaced the stat with new Ranco K59 but that has not helped. The fridge seems to be something like normal temperature about 3 degree C but the freezer is not going below -5 degree C. The stat seems to be cutting the compressor when the fridge reaches correct operating temperature.
Is there not some other sensor in this unit that ensures the compressor keeps working until the freezer has reached correct operating temperature? Looking at the wiring for the stat, there are two wires on pins 3 and 4 that I cannot fathom out what they do. They disappear into the back of fridge but do not appear again. Are these some sort of sensor for freezer? If so can I replace or is the fridge unserviceable?
Re: Zanussi Fridge Freezer defrosting on freezer
Is it in a cold room?
The freezer has no means of temperature regulation, it is all done from the temp on the rear plate of the fridge. Therefore if the room gets to below 12 deg. C for any length of time, poor freezer results.
The wiring.. Live in, usually black, Lead to compressor, usually brown, white lead to defrost heater situated on rear of fridge. Take a look under the thermostat housing and see if you have a little red switch, if so turn it on as that will decrease the switch off time and make the freezer more efficient when the room is cold.
Alex
Re: Zanussi Fridge Freezer defrosting on freezer
Alex
The FF is in kitchen which is usually warm enough but this weather and overnight is getting below 12 deg C. I have never noticed any problem until this year. I had the thermostat housing off to replace stat and did not see any red switch. Is this the only way of altering the switch off time?
Any other suggestions out there as to how I can get freezer colder if only the fridge stat operates compressor?
Do you know what these other white wires attached to stat pins 3 and 4 do?
Re: Zanussi Fridge Freezer defrosting on freezer
The white wires will be the defrost heater. If it is open crcuit then the problem with a cold room will be worse as the fridge will take longer to switch on after defrost.
Unplug first if you are checking with a meter!
Re: Zanussi Fridge Freezer defrosting on freezer
Simon
I’m not sure about the white wires. They are connected to pins 3 and 4 on stat. Without looking, I cannot remember which way round but one of the pins is fed from the switch on the stat so is effectively always live so long as stat not switched off and the other is switched by the stat depending on temperature setting so would be live when the compressor is running. Therefore I cannot see how they are a circuit as they would then form a bridge and make compressor work continually.
There is apparently some form of heater for the back of fridge to defrost it at end of every compressor cycle – according to fridge instruction book. These wires must have something to do with the defrost operation but i am thinking that they connect to a relay switch somewhere but without circuit diagram then I’m at a loss.
Anyone have an idea how I can get hold of circuit diagram or more info? My other big freezer has the diagram stuck on its back panel. If there is problem with the defrost heater on the fridge then is it curtains for the fridge as the heater must be sealed inside insulation? I checked out all of the freezer defrost circuits that are driven by the timer switch and they are working OK.
Re: Zanussi Fridge Freezer defrosting on freezer
Basically heater is across switch contacts of thermostat. If switch is open Current will flow through heater. If switch is closed current will flow through contacts to supply compressor. Therefore either compressor is running or heater is on.
Dont forget to unplug.
Re: Zanussi Fridge Freezer defrosting on freezer
Simon
I could be being a little thick here but the stat only has three contacts (besides earth). these are numbered 4, 6, 3 – 6 is the live feed in, (I cannot remember which is which on the others without taking housing off) but one (lets say 3) is connected to the temperature switching function of the stat and the other (4) is connected to the on / off function of the stat. These white wires which we believe to be the defrost heater are connected to pins 3 and 4. There are no other pins. So I am struggling to see that the white wires form a circuit as one is connected to the live pin 4 (live so long as stat is switched on) and one connected to the temperature switched pin 3 that drives the compressor. I understand that somehow these wires are part of the defrost circuit but do not see how at the moment. I can get the meter on them at weekend.
Re: Zanussi Fridge Freezer defrosting on freezer
Perhaps its time for an engineer. You could try clicking on the red toolbox on the homepage.
Re: Zanussi Fridge Freezer defrosting on freezer
Got around to checking wiring on the defrost heater for fridge and this is OK – it is NOT open circuit.
However I have had another look in freezer compartment when compressor is running. I removed rear cover, insulation panel to expose fan and evaporator coil. Although fan is running, the coil in freezer is not getting cold but the fridge is still chilling. The problem was previously intermittent but has now become a permanent failure of the freezer to get cold. I am assuming that both the fridge and freezer evaporators work from the same continuous pipework.
Any ideas and does this sound terminal.
Re: Zanussi Fridge Freezer defrosting on freezer
Hoggy, if the freezer evaporator is not cold & fridge is ok then you most likely have a small leak somewhere. If you leave it then eventually the fridge will probably fail as well. If you’ve got a DF62/21FF then it must be over 12 years old by now and will be charged with R12 – a cfc gas so check around with your local engineers, some wont touch it, others will regas with a “drop in” replacement but unless the cause of the leak can be found youre wasting your time and your money. You need to weigh up the cost of regassing against how much longer this thing will realisticly last.
Re: Zanussi Fridge Freezer defrosting on freezer
Thanks. I feared as much so will probable wait for the fridge to give up or the next sales to arrive as we have big freezer in garage for the frozen stuff.
hi ive got a zanussi df47/55 a fiew years ago sumbody put a new fridge thermastat in an sead they dident now if wiering was wright now its gon again ive put anew one in myself but ow ll it seams to due is run untel my fridge runs like a freazer not turning of or defrosting have u got the wiering pattern or could it be somthing else thankes
Re: Zanussi Fridge Freezer defrosting on freezer
It sounds like it’s wired incorrectly or the thermostat was damaged on fitting.
Was the capillary longer on the new one, did you shorten it or kink it anywhere ?
Dave.
Re: Zanussi Fridge Freezer defrosting on freezer
ive just found out the previos owners had the same fault and they say they wired it up bakwords? so i dont now what the wiering should be now
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