Frigidaire Refrigerator FPBC2277RFH Freezer cold, refrigerator warm

[Charvs]

Model Number

FPBC2277RFH

Brand

Frigidaire

Age

1-5 years

Freezer is cold, refrigerator is warm, and ice/frost build up at evaporator. Did the following test mode:
1) 2 - defrost heater works when set to “on”
2) 29 FF Thermistor - 2F
3) 30 FZ Thermistor - 64F
4) 30 Freezer Evaporator Thermistor - 99F
5) 15 Freezer Evaporator Fan - working
6) 22 Damper - working

I’m suspecting the evaporator thermistor is bad that’s why it is not defrosting but I can’t find it in stock. Is there any replacement part that I can use that will work on this model?

 

[Jake]

1) 2 - defrost heater works when set to “on”

If the defrost heater works and gets hot, then your defrost thermostat is good.

To verify that--->You can ohm test the defrost thermostat WHILE ITS FROSTY to see if it has continuity.

If its not frosty, Watch this video:

Fridge Warm? Defrost Thermostat Testing, Troubleshooting | Repair Clinic

Freezer is cold but refrigerator is warm? This video provides information on how to test a defrost thermostat on a refrigerator. Learn more from the experts at Repair Clinic.

www.anrdoezrs.net

Leave it in the ice water for at least 5 minutes before ohm testing it.

Here's the defrost thermostat for your model:

Frigidaire 5304521781 Thermostat (AP6893121) - AppliancePartsPros.com

Thermostat 5304521781 / AP6893121 made by Frigidaire

click.linksynergy.com

Watch this video to access it:

When the defrost heater comes on and gets hot in FORCED DEFROST MODE, that indicates BOTH the defrost thermostat and the defrost heater are good, then only other part that controls the defrost cycle is the main control board.

Here's the main control board for your model:

Frigidaire 5304510305 Board Assembly (AP6278378) - AppliancePartsPros.com

BOARD ASSEMBLY 5304510305 / AP6278378 made by Frigidaire

click.linksynergy.com

Jake

 

[Charvs]

When the defrost heater comes on and gets hot in FORCED DEFROST MODE, that indicates BOTH the defrost thermostat and the defrost heater are good, then only other part that controls the defrost cycle is the main control board.

I want to replace the freezer evaporator thermistor first because it is reading high 99F. That thermistor is the one sending signal to the board right to activate the defrost system? The problem is they don’t have that in stock even the manufacturer. Looking for different thermistor that will also work on this model if there’s any.

 

[Jake]

That thermistor is the one sending signal to the board right to activate the defrost system?

You are correct, sorry my bad, I did not see that listed the first time, this is a newer style I have not come across as of yet with both.

The problem is they don’t have that in stock even the manufacturer. Looking for different thermistor that will also work on this model if there’s any.

Here's the freezer evaporator thermistor for your model:

Frigidaire 5303918776 Thermistor (AP6041625) - AppliancePartsPros.com

THERMISTOR 5303918776 / AP6041625 made by Frigidaire

click.linksynergy.com

I don't know any substitute for it, sorry.

Here's another thread about this same issue:

Frigidaire Refrigerator Gallery LGHD2369TF1 freezer fine but fridge part warm

You are correct, my bad, I did not see that listed the first time, this is a newer style I have not come across as of yet with both. Here it is...

www.applianceblog.com

Jake

 

[Charvs]

I just want to give an update on my refrigerator. If someone is having problem with their evaporator defrost thermistor since my thermistor model number has been out of stock for awhile. I hope this is a permanent fix that it won’t act up again.

I opened/removed the evaporator cover to access the said thermistor (Unplug the refrigerator first). I removed the thermistor and cut the wire and extended the wire using 2 alligator clips as shown on pictures. To make sure I don’t have any problem with the wiring (most likely not) from the thermistor to the main board I go ahead tested the wires. It is the pin 5 & 6 on J6 plug. Pins 5 & 6 is a white cable with 2 gray conductors inside. I took a glass of water with ice so I can test it. Mine was stocked to 99F even though my evaporator was frosty. I’m thinking whatever is inside the thermistor might be stocked. So I did hit the thermistor on the floor (make sure the clips are facing upwards so you won’t break it. Yes, I slammed it on the floor hard for how many times) and I noticed when I put it back on the ice the temperature went down to mid 40s and did it again till it went down to 35F. You can check the temperature using the Test Mode #2 or #39 it will show the evaporator thermistor temperature. To make sure it will not stock to 99F again I let it warm up using warm water then put it to ice water again and see if it will go down to 35F again and it did. It’s been 3 days so far and my refrigerator is back to normal 😬.

 

[jtstp17]

I just want to give an update on my refrigerator. If someone is having problem with their evaporator defrost thermistor since my thermistor model number has been out of stock for awhile. I hope this is a permanent fix that it won’t act up again.

I opened/removed the evaporator cover to access the said thermistor (Unplug the refrigerator first). I removed the thermistor and cut the wire and extended the wire using 2 alligator clips as shown on pictures. To make sure I don’t have any problem with the wiring (most likely not) from the thermistor to the main board I go ahead tested the wires. It is the pin 5 & 6 on J6 plug. Pins 5 & 6 is a white cable with 2 gray conductors inside. I took a glass of water with ice so I can test it. Mine was stocked to 99F even though my evaporator was frosty. I’m thinking whatever is inside the thermistor might be stocked. So I did hit the thermistor on the floor (make sure the clips are facing upwards so you won’t break it. Yes, I slammed it on the floor hard for how many times) and I noticed when I put it back on the ice the temperature went down to mid 40s and did it again till it went down to 35F. You can check the temperature using the Test Mode #2 or #39 it will show the evaporator thermistor temperature. To make sure it will not stock to 99F again I let it warm up using warm water then put it to ice water again and see if it will go down to 35F again and it did. It’s been 3 days so far and my refrigerator is back to normal 😬.

LOL what?! that is crazy

 

[Charvs]

Yup, that’s crazy but it works. FYI, before doing that crazy steps. I ordered a different evaporator defrost thermistor hoping it will work but when I installed it, it can only go down to 82F so still it will not defrost 👎. Try it nothing to loose just your time. I will report back if it went bad again.

 

[jtstp17]

My fridge is able to work right now with the manual defrost. But have to do it 3x a day.

My thermistor currently looks different than yours though. I would have to cut the wire and crimp it back.

 

[Charvs]

Yes, that’s what I’m doing it, too for how many months and I’m tired of it. Believe me we have the same thermistor part number 5303918776 as Jake posted. Soldered mine back. Good luck.

 

[jtstp17]

where did you cut it?

 

[Charvs]

Like 5 inches from the thermistor.

 

[jtstp17]

could you just hit it instead of cutting it and hitting it?

 

[Charvs]

I guess you can if you can hit it hard enough but if not you can cut it, extend it to test and splice it back using wire nuts.

 

[Dan O.]

Yup, that’s crazy but it works.

Yes crazy. A thermistor is a solid state component like a resistor... but just one that is also affected by the temperature it is subjected to. I can't imagine whacking a resistor to get a different reading.

JMO

Dan O.