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Frigidaire Professional mod# FPBC2277RF9 - evaporator coil frosted up too much

CapeFearElvis

Premium Member
Joined
Mar 10, 2023
Messages
4
Location
Wilmington, NC
Model Number
FPBC2277RF9
Brand
Frigidaire
Age
6-10 years
Hello everyone! There are so many similar threads that it makes one's head spin, but I'm out of options with a Frigidaire Professional french door refrigerator with the freezer on the bottom. Here's a brief list of three things, what IS working, what MAY be working, what I believe is NOT working, then comes a description of what I've found and done to try to get this machine working.


What IS working:
Evaporator Fan runs as it should each time the doors are closed.
Compressor Fan is running as it should - no broken or damaged blades
Water pumps are sending water to the door and to the ice-maker, but the ice-maker won't drop the ice (too warm maybe?)
Compressor is running, but I can't get the plug off of it to verify resistance is the same across all three connectors on the compressor
Thermistor behind the Fresh Food section (refrigerator) panel checks to close to the only specs I can find: at 67deg, 12.2K ohms; at 30deg, 29.6K ohms

What MAY BE working:
Defrost Thermostat on the ice-maker evaporator - closes when put in the ice-bin, opens when above freezing
Defrost Heater on ice-maker - no continuity, but has resistance reading of the identical new part.
Defrost Thermostat on the lower/primary evaporator - closes when put in the ice-bin, opens when above freezing
Defrost Heater on primary evap coil has continuity, so I think this is ok

What I think is NOT working:
Thermistor on the lower/primary evaporator - readings: at 67deg room temp, 5.4k ohms; at 32deg ice-water test, 6.1k ohms; at 10deg ice-bin, 5.7k ohms
Of course, this is the one part that is on nationwide backorder right now. I can't find this part (p/n 808137001) ANYWHERE!


I bought this thing used about 10 days ago. For the first 5 days, things went well, ice was being made, the freezer was at 0 degrees, and the fridge was maintaining 34 degrees, but something was working against me behind the scenes (really behind the panels). On the 6th day, I woke to a warm refrigerator, and the ice-maker had gone dry two nights before.

So, I decide to take the ice-maker out to see what's stopped it from producing cubes, thinking that it might be tied to the warm refrigerator side. The freezer was unfazed by what was going on in the ice-maker and refrigerator, showing a steady 0 degrees on the door-edge display. I unplugged the unit from AC power, and took the icemaker out component by component until I finally removed the housing for the fan and auger motor that covers the evap coils, defrost heater, and defrost thermostat (attached to evap coil). All I could see from here was a block of frost/ice. Out with the hair-dryer, and about an hour later, I have a defrosted ice-maker.

Now, I know what a defrost heater looks like, and I can recognize the defrost thermostat, but I can't check them with a meter beyond dropping them in an ice-maker of a 2nd refrigerator/freezer, into a glass of ice-water, or at room temperature with my meter and taking readings. I have readings, but I don't know if they're in specification. How do I do that? I called Frigidaire; they won't give me the specs, and I searched for DAYS online trying to find out how to test these.

I was able to get the defrost thermometer to close in my outside freezer, but I can't be certain of the temperature at which it closed. I tried to check the defrost heater for continuity, but there is none. I ordered a new one, sure that "no continuity" meant it was bad, but the new one has no continuity either. Resistance across the terminals of both the old defrost heater and new defrost heater at room temperature is right at 180 ohms; the new part did NOT get installed. Instead, I put the ice-maker back together and since the unit had been unplugged for at least a day, I figured I'd see how it did with a fresh startup.

The ice-maker made one tray of ice, and then called no joy. It wasn't going to make another cube, but it hadn't affected the refrigerator; it was still hot, like 60 degrees. The freezer cooled, but never got colder than about 13 degrees (F) after about 5 hours of running. WTF? So, I unplug it again, take the icemaker back out to see what's happening with the coils; it's on its way to freezing over again. But I also decide to take a look at the primary evap coil behind the freezer. Holy glacier Batman!

The evaporator behind the freezer section was a solid block of frost and ice! It took 2-3 hours for all the ice to melt. At that point, I tested the thermistor in the Fresh Food section (refrigerator), checked that the air damper was free to move (but can't check it operating with everything disassembled, or can i?), and checked the defrost thermostat on the evaporator to see if it was closing under freezing. Like the one in the ice-maker, it seems to close when cold, and open when warm. The thermistor in the FF section read 12.2k ohms at 67deg room temp and 29.6k ohms at about 32deg ice-water test.

However, I'm now stuck. The freezer doesn't want to cool properly, staying at 13deg, the fridge is at 60deg, and the ice-maker doesn't make ice. Can anyone on this forum help me with specifications for the parts contained within this machine or give me direction on which way to go get this running properly again?

Here are the Frigidaire part numbers that I'd like to be able to test (need specifications):
242094802 Defrost Heater for Ice-Maker
5303918810 Defrost Thermostat for Ice-Maker
5304521781 Defrost Thermostat for primary Evaporator
808137001 Thermistor for primary Evaporator (yes, there is a thermistor and a defrost thermostat)
240597203 Thermistor for FF (refrigerator) section
241518501 Air Damper - how can I check that this is operating?

I've attached a few photos here showing the icebergs I've been dealing with. Any help would be GREATLY APPRECIATED!!!

Thank you!!!!!!!!!!!!!!!!!!!!!!
 

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Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
139,337
Location
Vicksburg Junction, Arizona
Of course, this is the one part that is on nationwide backorder right now. I can't find this part (p/n 808137001) ANYWHERE!

Part number 808137001, which is the evaporator thermistor, which tells the defrost heater to come on.

That's likely the issue, did you ohm test it? I ohm tested mine and it was dead.
 

CapeFearElvis

Premium Member
Joined
Mar 10, 2023
Messages
4
Location
Wilmington, NC
Thank you for the reply Jake! I'm also getting the ice-maker evaporator coil freezing up, but there is no thermistor, just a defrost thermostat. It's worth noting that the primary (fresh food side) evaporator has BOTH a thermistor and a defrost thermostat, but you probably know that.

I did test the thermistor with my meter for ohms readings. The results were:

At 68deg (room temp), it measured 5400 ohms
At 32deg (in icewater), it measured 6100 ohms
At 5deg (in my other ice-bin), it measured 5730 ohms

Without knowing its specs, however, I don't know what to do with those measurements.
 
Last edited:

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
139,337
Location
Vicksburg Junction, Arizona
It's worth noting that the primary (fresh food side) evaporator has BOTH a thermistor and a defrost thermostat, but you probably know that.
Yes, I knew that.:)

That larger defrost thermostat is just a safety thermostat in case the heating element does not shut off.

You are correct, it does not mention what the ohms reading should be for the evaporator thermistor.

I'm attaching your tech. data sheet below.

Look under SYSTEM DIAGNOSTIC MODE--->TEST 39
UI shows temperature sensed by evaporator thermistor; pass if within 10°F of temperature measured with gauge at evaporator thermistor location. “OP” if open; “SH” if short.
 

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CapeFearElvis

Premium Member
Joined
Mar 10, 2023
Messages
4
Location
Wilmington, NC
Thank you Jake. I'll try to run those test sequences as mine didn't have the spec sheet under the cabinet.

Reading down the lists, can these tests be performed with part of the system removed, like the icemaker? There's no way I can tell if the defrost heater is working if I can't reach it because it's installed.

Are "OP" and "SH" (and the other abbreviations) essentially a failure? What do they mean? How is that interpreted?

Thank you.
 

CapeFearElvis

Premium Member
Joined
Mar 10, 2023
Messages
4
Location
Wilmington, NC
Now, this is really confusing...
I put this machine back together last evening so that everything would be connected to run the test sequences, set the refrigerator and freezer temps at 35deg and 0deg respectively, then left it on overnight.
When I opened the door with the display panel this morning, the temps were at 35deg and 0deg, and both compartments are cold like they should be. What is going on with this machine???
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
139,337
Location
Vicksburg Junction, Arizona
Reading down the lists, can these tests be performed with part of the system removed, like the icemaker?
That I don't know, never tried that before myself.

There's no way I can tell if the defrost heater is working if I can't reach it because it's installed.
You can remove the ice maker AFTER that test and see if the evaporator is clear of frost.

But I think TEST 39 is for the freezer evaporator coil.

Now, this is really confusing...
I put this machine back together last evening so that everything would be connected to run the test sequences, set the refrigerator and freezer temps at 35deg and 0deg respectively, then left it on overnight.
When I opened the door with the display panel this morning, the temps were at 35deg and 0deg, and both compartments are cold like they should be. What is going on with this machine???
That is very odd, I'm not sure why its doing that either.
 
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