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FIXED KitchenAid Five Drawer Refrigerator KRMF706ESS01 - not cooling in refrigerator section

AppliancePete

Premium Member
Joined
Sep 27, 2021
Messages
5
Location
Southern California, USA
Model Number
KRMF706ESS01
Brand
KitchenAid
Age
1-5 years
Make: KitchenAid
Model: KRMF706ESS01
Age: About 4 years old.

I have a fridge of many symptoms… trying to isolate.

Almost immediately after the fridge was installed, it had an icing issue and KitchenAid sent out a technician who ordered a new fan and damper motor, but ended up replacing the control board. He also moved the temp sensor lower down on the evaporator per a KitchenAid bulletin. I have the new fan and damper.

Since then, the fridge has iced up a couple of times, but each time we would turn off the cooling, put igloo blocks in the fridge compartment allow it to thaw, and then turn cooling back on. I blamed it on my wife who has no issue putting hot food in the fridge - like soup…. We had a bad fridge before, so we have a monitor that we watch - before the food goes bad.

Recently, the evaporator fan stopped blowing, so I took everything out of the fresh food compartment and disassembled basically everything to replace it. The new fan doesn’t work either.

I reviewed the schematic, and the voltage from the power supply board matches the specifications. However, the constant voltage for the fan measures as 12.7v vs. the 14v called for on the schematic.

The other connections measure out at 12.7 consistent with the specification.

So - it’s the control board right? It seems odd to me that they would boost the voltage there instead of in the power supply. Can anyone confirm that it should in fact be 14v? This could also explain the prior behavior as the dc to dc converter was going bad and there was not enough voltage to run the fan.

Thank you for any help you can offer.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
128,857
Location
Redmond, Oregon
I'm attaching your tech. data sheet below, it says 12.7 volts for the refrigerator evaporator fan motor.

Here's the FRESH FOOD EVAPORATOR FAN MOTOR video for your model:
Evaporator Fan Motor W11087438


Look here too:

Jake
 

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AppliancePete

Premium Member
Joined
Sep 27, 2021
Messages
5
Location
Southern California, USA
Right - replaced the fan, and it does not run. Looking at the spec sheet, between pins 6-7 on header 14, there should be 14vdc. When I check it with a meter, I’m only getting 12.7.

The other connections, 2-3, and 3-4, measure out at 12.7 - which matches the spec sheet.
 
Last edited:

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
128,857
Location
Redmond, Oregon
Yes, I know its confusing that it says 14 Volts DC on the fan motor, but the tech. data sheet says it should only get 12.7 Volts DC.

Connector P14 pins 3 and 4 is the voltage to that fan motor, use your meter AT that fan motor and see if you get 12.7 Volts DC, tape the door switch closed first.

Its the YL(YELLOW) and RD(RED) wires at that fan motor.

Jake
 

AppliancePete

Premium Member
Joined
Sep 27, 2021
Messages
5
Location
Southern California, USA
It tests out to 12.6v. Neither fan turns when plugged in to the connector.

I can hear the other fans running when I turn them all on using the service menu.
 

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Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
128,857
Location
Redmond, Oregon
Then you must have bad connector pins, look inside the connector and see.

If you find nothing wrong, then you will need to have KitchenAid come out to investigate.

Jake
 

AppliancePete

Premium Member
Joined
Sep 27, 2021
Messages
5
Location
Southern California, USA
Update - We have a home warranty - and they sent out four different techs from different companies to look at it. They replaced everything. All of the control and power boards, and the damper and evaporator fan - twice. Today they sent me a check to go away and get a new refrigerator. The check did not cover the cost of the refrigerator - nor does it include payment for hauling the old one away.

So - before putting this 4K fridge on the curb to await a new one from wherever they come from - I pulled out the ole multimeter and the ole oscilloscope to have a look - now that it's been declared a junker.

The main circuit board is putting out the correct voltage and the correct pulses to run the motor... however - when I check inside the fridge, the connector doesn't show the voltage to run the fan - although it does show the proper motor pulses. So if I can get 12V inside the compartment - I should be golden. The first thing I'm going to try is clipping the connector and hard wiring the fan motor. any other ideas?
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
128,857
Location
Redmond, Oregon
Excellent Pete, glad you found the problem was the bad connector.(y)

I recall another member that found the same:

Thanks for the update!

Jake
 
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