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AlexM

Fridgidaire Refrigerator Model# PLHS267ZCB2, Evap Fan Oscillating On and Off.

6 posts in this topic

This Fridgidaire Fridge Model# PLHS267ZCB2 had a evap fan that was turning off and on every 2 or 3 seconds.  The freezer and fridge may have been 5 to 10 degrees higher than normal, but everything else was running fine.  I left the unit on and unplugged the fan and tested for constant 120vac and it was steady, no voltage variation.  So I replaced the evap fan with P/N SM999 and put everything back together and the new fan was steady.  Now I got a call back today that the fan was doing the same thing again...Main board, or something else?  Thanks in advance.

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The evap fan is controlled by the adc board which in turn is given instructions by the freezer and ff temp controls as to when to turn on the fan. Intermittent failure in any of these three could cause your problem. The Adc also starts the fan 7 min after defrost terminator closes so there could be a failure here as well. I would check both cold controls for sparking by messing with them a bit. If no sparking, and If you are lucky enough to catch the fan acting up, bypass each of the controls in turn. If the problem stops, the one which is bypassed, well... that's your huckleberry. If problem persists, change adc board (more prone to failure) . All of this is subject to any wiring or connection failure.

"Meanwhile our hero AlexM (Doc Holliday), once again confronts the villainous Frigidaire (Johnny Ringo). But this time our protagonist is more confident and armed with additional firepower....."

"to be continued..."

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... unplugged the fan and tested for constant 120vac

ALL voltage measurements should be made with the devices connected,

unless otherwise directed.

 

The manufacturer has replaced part number 241508001

with this item, part number 5303918476

http://www.repairclinic.com/referral.asp?R=154&N=1614983

 

Defrost-Control-Board-5303918476-0117628

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OK, so I went back today and now the damper motor is acting funny and is opening and closing back to back. 

 

I will need to replace the Defrost Control Board and wiring harness, or just the actual Board?

 

And will I need to change out the FF and Freezer thermostat(s) ?

 

Thanks,

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Hello, my funny-acting friend.  Frigidaire is bundling the ADC board with a new wire harness and a detailed instruction sheet.  You can bet your sweet infidel rear end that when a manufacturer does this, there is an existential need for all the items.  Usually, it is to quietly correct an engineering mistake.  Sometimes, to address a problem with components such as a faulty wire harnesses which has come to their attention by numerous technician suicide bombings after working on Frigidaire appliances.  You would be well advised to use all the components and carefully follow the instructions provided in the kit that our dear friend, Regulator, has linked you to.  

 

As for the thermostats, do you have a reason to think they are bad?  They are simple mechanical devices that merely open or close in response to temperature.  Is one or both stuck open or closed, as determined by measuring continuity at their electrical contacts?  

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With multiple problems, first assume they are related. Then look to any component that controls or affects all of the problems..ie what component(s) affect both damper door and fan? In your fridge it's the ADC board and thermostats. Odds are, based upon Moostfa's info regarding ADC/harness issue and the failure prone nature of these boards, it's the ADC board. So based on the odds, and after a cursory check of the thermostats, get the adc board first (from repairclinic so you can send it back if the issue continues).

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