Author Topic: How to force defrost in Kitchenaid fridg. KBRS19KTWH5  (Read 563 times)

Offline go400

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How to force defrost in Kitchenaid fridg. KBRS19KTWH5
« on: May 05, 2014, 04:51:00 PM »
I may need the service manual to force test adaptive defrost, hope someone has seen this before, fridg is bottom freezer
 with single, upper door.

Offline AJ

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Re: How to force defrost in Kitchenaid fridg. KBRS19KTWH5
« Reply #1 on: May 05, 2014, 05:13:56 PM »
From the attached tech sheet. Hope it helps.

 

 
 
 
 Defrost Operation:
The Control Board adapts the compressor run time between defrosts to achieve optimum defrost intervals by monitoring the length of time the defrost heater is on.
 After initial power up, defrost interval is 4 hours compressor run time. Defrost occurs immediately after the 4 hours.
Note: Once unit is ready to defrost there is a 4 minute wait time prior to the beginning of the defrost cycle. Optimum defrost is 15 minutes. Each additional minute the defrost thermostat remains closed, 1 hr. is subtracted from the previous defrost interval. Each minute the thermostat opens prior to optimum defrost, it extends the next defrost interval 1 hr. When defrost thermostat opens there is a 4-6 minute drip time before compressor restarts or Control Board will terminate defrost at 25 minutes if defrost thermostat has not opened and will reset the defrost interval to the 8 hr. minimum setting.
 4 hours of continuous compressor run resets the next defrost interval to 8 hours and will initiate a defrost, if 8 hours of compressor run time has also occurred.

Forced Defrost Mode:
The forced defrost function is performed using the refrigerator display and keypad. Enter the Forced Defrost Mode by performing the following sequence of events:
 
  • Hold the refrigerator door light switch closed.
     
    Press the Refrigerator Temperature DOWN /- keypad 3 times consecutively.
     
Note: The 3 keystrokes must be consecutive and within 10 seconds.
 
  • Release the refrigerator door light switch.
     
    The control will display F- d to confirm entry into the Forced Defrost Mode.
     
    Entry is confirmed by pressing the Refrigerator Temperature DOWN /- key once more. The unit is off and in
     
the Defrost Mode.
Note: All control functions will be turned off (Compressor, Defrost, Evaporator Fan, the damper will remain in its current position).
 6. The control will default to the short run period test.
 
Note: You can toggle between the S Short and L Long test mode by pressing the Refrigerator Temperature UP /+ Key. Long Test mode is used for factory test and should not be used in the field.

7. Once the desired mode is displayed, confirm the forced defrost by pressing the Refrigerator Temperature DOWN /- Key once. The defrost will begin immediately and the display will return to a normal operating display with set point values.
 8. Close the Refrigerator door(s). You are in the defrost mode.

Note: Forced Defrost mode can be exited at any time prior to step 7 by closing the Refrigerator Door(s).
   
Hope you find our site helpful.

Offline go400

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Re: How to force defrost in Kitchenaid fridg. KBRS19KTWH5
« Reply #2 on: May 05, 2014, 06:26:05 PM »
Thanks AJ, really appreciate the info, will check defrost, hope the control board is ok.
 Rich

Offline AJ

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Re: How to force defrost in Kitchenaid fridg. KBRS19KTWH5
« Reply #3 on: May 05, 2014, 06:45:19 PM »
Please let us know how it turns out.
Hope you find our site helpful.

Offline go400

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Re: How to force defrost in Kitchenaid fridg. KBRS19KTWH5
« Reply #4 on: May 06, 2014, 05:28:38 PM »
Will do, so far it's ok, replaced defrost thermostat, seems to have fixed it.

Offline go400

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Re: How to force defrost in Kitchenaid fridg. KBRS19KTWH5
« Reply #5 on: May 22, 2014, 10:08:41 AM »
Well, the defrost failed after two weeks. Put it in defrost and found the control is only sending 1 amp to the defrost circuit.
 Told customer there probably is a burnt wire someplace, or the control is bad in some way as the calrod heater measures the standard
 27 ohms.
 Customer decided to replace unit and she gave me the fridg.
 Never saw a problem like this so I am leaning toward a bad control.

Offline AJ

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Re: How to force defrost in Kitchenaid fridg. KBRS19KTWH5
« Reply #6 on: May 22, 2014, 04:54:09 PM »
What you going to do with the refrigerator now, replace the control or scrap it?
Hope you find our site helpful.

Offline go400

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Re: How to force defrost in Kitchenaid fridg. KBRS19KTWH5
« Reply #7 on: May 22, 2014, 06:23:43 PM »
Fridg is only 3 years old, very nice. Will tear apart, look for burnt wires, then test output of control. If control is bad, will probably
sell it cheap, rather than fix it. Maybe someone with knowledge in board repair can fix it. Module is $119, may be worth fixing.

 

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