Hi @gusf ,
It seems to be a problem with the sealed system.
You said that there was no ice build up on the evap unit but is there ice build up anywhere else e.g. pipes into evap unit from condenser or into compressor from evap unit etc which may indicate restricted flow?
Being intermittent makes it difficult but I’m wondering if perhaps you have a clogged filter dryer that is restricting the flow occasionally.
Perhaps high and low pressures in the sealed system needs to be checked when the temp is warm and the compressor is running. I don’t know how it is where you are but here you need a licensed repairer to service the sealed system due to the environmental regulations regarding the handling of refrigerant gases.
Also here’s the service manual that may help as it has the parts list and shows locations etc of all the parts.
It also details how to perform a manual defrost as I was wondering if you can make it happen by doing a manual defrost and check if it happens shortly afterwards.
I realize that you said the defrost is OK but I’m wondering that if there is a restriction in the sealed system e.g. at the expansion valve or in the filter dryer due to floating sediment in the system.
It may be more noticeable after a defrost as it has had time to settle and cause the blockage as there has been no compressor pumping the refrigerant through the system during the defrost rather than when the compressor has been working for a long while so the flow is continuous and keeping things moving so to speak.
This may be also occurring when the freezer reaches the set temp in that the compressor will be turned off and only turned on again when the temp in the freezer needs to be driven back down again as it has risen above the required set temp range i.e. no refrigerant flow occurring in the system the same as when in defrost mode.
If you try this don’t let the defrost occur for too long so as to not damage the evap unit by letting it get too warm. Most defrost cycles are for 15-20 minutes but your model may be different.
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4 Kommentare
Hi,
What is the make and model number of the freezer?
Not sure i understand when you say the evaporator gets cool. Do you mean it warms up to only cool from being icy cold as it should normally be?
You're not confusing the condenser which is outside the freezer compartment (sometimes on the back of the cabinet or underneath with the compressor) with the evaporator which is inside the freezer compartment (usually behind a panel and hidden from view) are you?
Can you hear the evaporator fan running inside the freezer compartment when the freezer gets warm? It should stop when the door is opened and start again when the door is shut
von jayeff
Hi, thanks for your message,
It’s a turbo air M3F24.
Yes I meant the condenser gets cool , not the evaporator. It is usually hot when it’s running, but all of a sudden it cools down as if the refrigerant was not moving.
The evaporator fan is working fine too (but I will double check again tomorrow to be on the safe side though as it is a very fair point). We had an issue with the evaporator not working a year ago and the freezer would not go down, but would still keep around 0. This time, when we arrive (so it has gone through defrost and has not been opened). it can be at 25F . When the evaporator fan was not working, it would be 0 when we arrive.
von Gus
@gusf
The evap fan distributes air dragged across the icy cold evap unit to cool the freezer down. If the fan is not working the evap is still icy cold but the air is not as cold as it is not being blown across the unit to cool it further if you get what I mean.
von jayeff
@jayeff
Yes I understand that (especially as this is an issue we have encounter in the past so I am familiar with it). This is not what is happening here though.
We had tech coming, and all they could tell is "call us when it happens". I start at 3am and finish at 11am, and it usually restarts after a couple of hours, so it is very very difficult to get a tech here when it happens. I am in NYC so the travel time would be too much and they would arrive when it is working again :(
von Gus