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RomanTorres

Frigidaire PLHS269ZCB2 evap fan runs intermittently.

17 posts in this topic

Hello, the evaporator motor runs intermittently, turns on a few seconds, then turns off a few more seconds, and repeat and repeat and repeat. Sometimes it works fine. Any idea?

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It could be one of three things

Bad evaporator fan motor Check voltage to motor. If constant 120vac then replace fan motor

Bad adaptive defrost control board My guess since both thermostats must be bad if fan is intermittent. The ff and freezer thermostats can both operate the fan when calling for cooling. Set both to maximum cooling and if fan continues to be intermittent, the probability of a bad adc board is very high and a bad thermostat is very low

Bad wiring;

You can try and reseat connections in the control box to see if that is causing it.

Bad freezer and fresh food thermostat... they would both have to be bad for intermittency unless one is satisfied (ie reached its temperature setting) , thus not calling for cooling and the other is intermittent .. see above... odds are against it.

Testing procedures for the adc can be provided if necessary.

Edited by DurhamAppliance

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Could be a bad adaptive defrost control board, a bad evaporator fan motor or a bad cold control.


Darn you're fast Durham!

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lol Scott... usually I'm slow,.. old age ya know... too bad they don't make a control kit for this model...if it's not the fan then a kit would fix it. But on this model, damper , adc and thermostats must be purchased and installed seperately. So you have to figure out where the problem is.

Edited by DurhamAppliance

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Actually I have used the kit on models that don't call for the kit and never had an issue.

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Thanks for your answers!

I think I have to check in the order provided, so I am going to check voltage to evap fan motor and post results.

 

Meanwhile, can I have the testing procedures for the adc board?

 

Thanks again!

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Hello,

 

I checked voltage to motor and when the motor stops, the voltage drops to zero, so I think the motor is ok. I set both thermostats to maximum cooling and fan continues to be intermittent, so I think both thermostats are ok too. I also reseat connections an everything seems ok.

 

I have to test the adc board, can you provide me with the testing procedures please?

 

Thanks!

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...

Testing procedures for the adc can be provided if necessary.

 

Hi, may I have the testing procedures please?

 

Thanks!

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Voltage between number 1 (BLK-HOT) and number 10 (LT BLU-Neutral) on the ADC is 115 VAC ± 10%, 60 Hertz. This supplies the power to operate the processes, Evaporator fan motor and Damper motor.

•The freezer cold control clnnected to 4 (orange wire) supplies line voltage to the ADC relay common contact to run the compressor and condenser fan motor, as well as the defrost system. It also supplies the signal to run the evaporator fan motor that is connected to 11 (red-white) .

Basically, if your compressor is running, you should have steady 120v between 4 and 10... that means your freezer control contacts are closed and calling for cooling. The ADC then sends 120vac to the evap fan on 11.

If you are not getting steady voltage of 120vac on 11 to 10 while compressor is running, then bad adc. If you are, then there is a problem in the connection or fan motor.

Edited by DurhamAppliance
changed fan test points to 11 to 10

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Hi,

With compressor running, I am getting strange and unstable readings between 11 and 1. The evap fan motor wires are RED/WHT (11) and LT-BLU (10), do I have to check between these terminals?

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No, that should read 11 to 10.

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I am sorry, I don't understand: 

 

With compressor running constantly and evap fan motor running intermittently:

 

a)  I am getting strange and unstable readings between 11 and 1.

B)  Voltage changes from 120 to zero (an viceversa) between 11 and 10 when evap fan motor goes from running to stop (an viceversa).

 

According to ADC box legends:

11 - RED/WHT - evap fan.

10 - LT-BLU - neutral.

1 - BLK - hot.

 

That means bad ADC, right?

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And if I have a bad ADC, I would like to order it from this website. I saw that now it is an orange box with wiring kit and instructions.

 

I am just waiting your helpful answer to proceed.

 

Thank you!

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Based o what you're measuring and reporting, it sounds like a bad ADC board Part number: AP4909015

Part number: AP4909015

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Thanks for your help, I am going to order it and post the results when installed.

 

Thanks again!

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Hello,

 

My new ADC board arrived yesterday and I installed it: now my fridge is working normal, the "evaporator motor runs intermittently" condition is no longer present, and I am very happy!

 

Thank you very much for your help, I really appreciate it.

 

Best regards!

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Nice job!  

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