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Voltage Fluctuations to Freezer Fan


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7 replies to this topic

#1 cheme101

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Posted 25 June 2005 - 06:17 AM

I have a Kenmore 25351699100 (or FRS23BH5CB0 equiv.).  Several months ago I began hearing what sounded like a motor revving up and down and sometimes a squeaky sound.  I eventually tracked it to the freezer fan.  I replaced the fan, but it continued after I plugged the unit back in.  I then tested the voltage coming into the fan.  It fluctuates irregularly between 115V and 96V. This is causing the up and down revving and noise. Wall plug voltage is constant.    What now?

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#2 Samurai Appliance Repair Man

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Posted 25 June 2005 - 02:23 PM

Post your wiring diagram so we can look at the circuit.  It reveals all.

#3 GLC

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Posted 25 June 2005 - 05:51 PM

This one does come of terminal 9 om the ADC board and my guess this is correct on this one. Some of these newer units have varialbe speed DC motors. Some one else please double check this.
Unless specifically asked otherwise, remember to test with the unit unplugged, or breaker off.
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#4 cheme101

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Posted 26 June 2005 - 03:50 AM

The wiring diagram.  The voltage feeding the fan is AC.

 

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#5 cheme101

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Posted 26 June 2005 - 03:51 AM

The wiring schematic.

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#6 The Seven

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Posted 26 June 2005 - 05:52 AM

The Evap Fan is connected to E9 of the Adaptive Defrost circuit board.
Measure the voltage at E9. If the voltage is constant, then there is a loosed connection between E9 and the Fan terminal.
If not, then the Adaptive Defrost is faulty (most likely there is burnt relay contact or solder point on the board).
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#7 jahjahbinks

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Posted 26 June 2005 - 05:18 PM

check the heater the heater is in series with the fan at the adc , if the heater is going bad and or the defrost tstat is giong bad this will cause problems with the fan(e.g. if the heater is open then the fan won`t run and the same for the defrost tstat )these send power back to the adc to feed the evap fan.
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#8 Pegi

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Posted 26 June 2005 - 05:33 PM

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