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Whirlpool Refrigerator WRF767SDEM01 ice building up

Outdoorsmen

Premium Member
Joined
Dec 18, 2021
Messages
3
Location
Texas
Model Number
WRF767SDEM01
Brand
Whirlpool
Age
1-5 years
Hi I have a french door twin tower cooling WRF767SDEM01 that keeps building up ice in refrigerator section. The refrigerator section is staying to warm but freezer is working normal. The evaporator fan # W11033168 has already been replaced and connections have been checked. If it thaws out it works fine until the ice slowing builds up again. It completely builds up the ice all the way past the evaporator fan.

Is it the control board or maybe the defrost heater? The defrost heater is not in stock anywhere. It is only about 3 years old.

Thank you for the help
 

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Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
129,011
Location
Redmond, Oregon
Ok, There is a service bulletin on this problem, I'm attaching it below.

Start on Page 2 to see if the evaporator thermistor is the correct position. Lots of members here found it was in the wrong position and reset it to the correct position and it fixed this problem, that evaporator thermistor controls the defrost cycle.

IMPORTANT: thoroughly defrost the entire evaporator. Excessive frost and ice build-up could cause future service calls.
1. Check the RC Defrost Thermistor for proper operation and placement.
a. Check resistance of thermistor per tech sheet resistance table.
b. Check Thermistor Location; it should be located as shown in figure 1. The thermistor should be tight and in full contact with the suction tube directly coming out of the Evaporator. Do not damage the paint while installing.
c. If the thermistor has a metal clamp, you may need to use a pair of pliers to gently squeeze the clamp to ensure good contact with the tubing (See Figure 2). Be sure not to crimp the Thermistor while closing the gap.

Let us know how it goes.

Jake
 

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Outdoorsmen

Premium Member
Joined
Dec 18, 2021
Messages
3
Location
Texas
Thank you Jake for sending the service bulletin.

I found the thermistor to be to be wrapped in aluminum tape and placed on the copper joint. I unwrapped it and moved it off the joint. (See attached photos)

I tried to bend clip tighten but it is not extremely snug against copper. It is touching it. Should I secure it tighter with a zip tie? Or do anything else?

I really appreciate your help
 

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Outdoorsmen

Premium Member
Joined
Dec 18, 2021
Messages
3
Location
Texas
Part 2 question
Should the sensor be located closer to the Evaporator coil ? I was looking at pictures online and noticed the placement was different than what I found this one. (See attached picture)
 

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Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
129,011
Location
Redmond, Oregon
You still have it too high, it has to be below that ridge.

I marked it on your photo BELOW THIS RIDGE.

FA6272A3-0BCC-40A0-B021-C845377509F3.jpeg


Jake
 

Victrix

Member
Joined
Feb 23, 2022
Messages
1
Location
NC
Part 2 question
Should the sensor be located closer to the Evaporator coil ? I was looking at pictures online and noticed the placement was different than what I found this one. (See attached picture)
I noticed Jake said to move the thermistor. Did that work? I have same issue with WFR757SDEM01 and my thermistor is not close to the coils like Jake recommends (kind of around a loop in the tube). If that worked for you it would be good to know. Side comment: from what I can tell that model's refrigerator compartment's evaporator does not have a defrost heater. The only heater I could find is with the freezer section's evaporator. Thanks.
 
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