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Frigidaire Refrigerator FPBC2277RFH Freezer cold, refrigerator warm

Charvs

Premium Member
Joined
Sep 16, 2022
Messages
8
Location
California
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

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
134,257
Location
Redmond, Oregon
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:

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

Here's the defrost thermostat for your model:

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:

Jake
 

Charvs

Premium Member
Joined
Sep 16, 2022
Messages
8
Location
California
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.
 
Last edited:

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
134,257
Location
Redmond, Oregon
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:

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

Here's another thread about this same issue:

Jake
 

Charvs

Premium Member
Joined
Sep 16, 2022
Messages
8
Location
California
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 😬.
 

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jtstp17

Premium Member
Joined
Apr 13, 2022
Messages
27
Location
USA
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

Premium Member
Joined
Sep 16, 2022
Messages
8
Location
California
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

Premium Member
Joined
Apr 13, 2022
Messages
27
Location
USA
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

Premium Member
Joined
Sep 16, 2022
Messages
8
Location
California
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.
 

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Charvs

Premium Member
Joined
Sep 16, 2022
Messages
8
Location
California
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.

Appliance Tech
Staff member
Joined
Oct 9, 2004
Messages
6,009
Location
Ontario, Canada
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.
 
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