Frigidaire sometimes blows hot air

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Old 11-19-20, 12:06 AM
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Frigidaire sometimes blows hot air

Today I opened the top freezer part of my fridge and noticed it was blowing hot air. Probably 70-80 degrees. But after a few minutes the air began to cool and was working properly. I suspect my freezer does this every now and then as I've noticed my ice defrosts and freezes again.

What could be the cause of this?

 
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Old 11-19-20, 04:37 AM
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Sounds like there is a problem with defrost.
Need a model number!!!
 
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Old 11-19-20, 06:48 PM
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Frigidaire Model FRT18SGH

Thanks for your help
 

Last edited by PJmax; 11-19-20 at 08:41 PM. Reason: resized pic
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Old 11-19-20, 09:16 PM
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Welcome to the forums.

One good thing...... you have a basic mechanical fridge. No complicated electronics or expensive boards. Keep this fridge as long as you can.

Now..... you could have one of several possible problem.
It sounds like your compressor is not always starting when it should.

At first it sounded like a defrost problem but when the fridge goes into defrost.... it shuts off all fans and the compressor. You may have a compressor starting problem. Have you noticed the compressor clicking abnormally when it starts ? Next time it's blowing hot air.... see if the compressor is running.

Exploded parts views and wiring diagrams
Defrost timer - 215846605

In the diagram..... the blue path is cooling. There are two fans and the compressor.
The red path is defrost. Defrost thermostat and defrost heater element.
So when in defrost the fans and compressor shouldn't be running.
 
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Old 11-19-20, 11:04 PM
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That was very informative, thanks!

This fridge came with an apartment I moved into recently, but I haven't really noticed any unusual clicking when the compressor turns on, although it does seem to make quite a bit of noise when it's on. It almost sounds like the sound a firework makes when it's launched into the air but at a much lower volume.

If I remember correctly, the compressor was not on when the fan was blowing hot air. I'm not 100% sure though, so I'll have to try to catch it blowing hot air again.
 
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Old 11-20-20, 07:25 AM
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If you go to the Sears Parts site there is a wiring diagram for this unit.

Looks like it only has one fan in the freezer (evaporator fan).

First determine if the noise is coming from the compressor or the evaporator fan.
Note that this may or may not have anything to do with your problem.

The defrost timer looks like it is an 8 hour / 30 minute timer.
So every 8 hours of compressor run time the unit will go into a defrost cycle4 for 30 minutes.

The way defrost works is the timer starts a defrost cycle (defrost heater on, compressor and fan off).
This is a set time ( 30 minutes).
At the top of the evaporator coils a defrost thermostat is attached. It opens at about 55 degrees and disconnects the heater.
The defrost cycle continiues for the rest of the 30 minutes but the heater is off.
At the end on the defrost cycle the compressor comes back on cooling the unit down.

So it could be that the defrost thermostat is not operating correctly. Could be that it is in the wrong place.


 
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Old 11-20-20, 12:05 PM
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Thanks, I'll try replacing the defrost thermostat first and placing it in the correct location. I don't know much about their placement. Where would the ideal location be for the defrost thermostat?
 
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Old 11-21-20, 06:52 AM
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Just Google " defrost thermostat replacement "
Lots of videos are available.

Also it looks like there should be foam stops/baffles on either side of the evaporator coil, check that they are there.

 
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Old 11-21-20, 07:21 PM
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I would severely doubt it's the defrost timer.
I have never seen one defrost and run the fridge at the same time.
The diagram posted is one of two at the Sear's site.
 
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Old 11-22-20, 07:20 AM
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I do not know which unit you have so pull the unit out and check if it has a condenser/compressor fan.
The unit I show will have a tray on the top of the compressor for the defrost water.
In any case in either instance the fan/fans are wired in parallel with the compressor so when the compressor is on the fan should be on and vice versa.

I would not purchase a new defrost thermostat now.
First check the evaporator coil and components behind the cover in the freezer.

I also have never seen a defrost timer run the fridge (compressor) and defrost at the same time.
I am not sure why Pjmax mentioned this.
 
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Old 11-22-20, 10:51 PM
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Member asked about defrost thermostat..... I mistook it as defrost timer.

My point is...... if you feel hot air blowing out of the area where it should be cold..... it is not in defrost mode.
It's in cooling mode but sounds like the compressor is not running.
 
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