KitchenAid Fridge

[Brandonledski]

Hi everyone I have a KitchenAid Fridge Model# KRFF507EWH01 where the coils in the fridge section(freezer section was fine) froze up solid. Any ideas as to what could be causing this to happen? See pictures below.

Pic1

Pic2

[16345Ed]

Defrost system failure 

One of these components failed

 heater, sensor/thermistor or control

 

[Brandonledski]

I dont seem to see a heat bar/pipe like the freezer but I see these two components which I assume are sensors

Pic1

[CrazyCarl]

At Whirlpool training they told us about this issue and I’ve seen it a lot in the past year. There could be an issue with the defrost thermistor which is brass colored and clipped to the evap coil, or it could be that it is not secured properly. If it is really loose then I’d take it off, take the clip off of it and then use some foil tape to tape it back where it was and then use a zip tie on top of that to keep it tightly in place. That sensor tells the electronic control when all the ice is gone, if it’s loose it will not read right. 
 

That’s what I would try first. If you feel confident you could check the resistance of the thermistor, should 2700 ohms or so at room temp

[Brandonledski]

43 minutes ago, CrazyCarl said:

At Whirlpool training they told us about this issue and I’ve seen it a lot in the past year. There could be an issue with the defrost thermistor which is brass colored and clipped to the evap coil, or it could be that it is not secured properly. If it is really loose then I’d take it off, take the clip off of it and then use some foil tape to tape it back where it was and then use a zip tie on top of that to keep it tightly in place. That sensor tells the electronic control when all the ice is gone, if it’s loose it will not read right. 
 

That’s what I would try first. If you feel confident you could check the resistance of the thermistor, should 2700 ohms or so at room temp

I am reading about 3000 ohms at a room temp for 70F. I also checked to see if the thermistor was secure. It appeared to be on there very well however I will try your securing method just in case. Is there anything else I should look at while I have this all opened?

[AccApp]

Replace that sensor and I believe the service bulletin has the technician move the thermistor higher up on the suction line.

[Vance R]

+1 for moving the thermistor up the tubing. Make sure the clip is a very tight fit, add zip tye and foil tape.