Author Topic: MSD2734GEQ Adaptive Defrost  (Read 1100 times)

Offline jason1979g

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MSD2734GEQ Adaptive Defrost
« on: September 28, 2013, 03:08:23 PM »
having problems with diag. this. i think the unit is stuck in defrost. when i jump orange to white all the fans and comp. come on. i changed the adaptive defrost board twice thinking the new one was defective. on the old AD board if i flick the relay the comp and fans come on. also on the print the defrost t-stat check 240ohms. which it is. now... i dont know if the 240ohms is open or closed.

thanks

Jason
« Last Edit: September 28, 2013, 03:23:13 PM by jason1979g »

Offline dab147315

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Re: MSD2734GEQ Adaptive Defrost
« Reply #1 on: September 28, 2013, 03:49:50 PM »
I know that the defrost heater will read about23.2 ohms.I see that on the diagram and some manuals i don't know where they are getting that higher ohm number.

Offline dab147315

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Re: MSD2734GEQ Adaptive Defrost
« Reply #2 on: September 28, 2013, 03:55:26 PM »
Maybe thermostat is erratic .What makes you think its stuck in defrost?

Offline jason1979g

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Re: MSD2734GEQ Adaptive Defrost
« Reply #3 on: September 28, 2013, 04:04:21 PM »
Because there is no ground to the fans or compressor.  When I jump orange wire to the white wire on the AD it powers on.

Offline dab147315

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Re: MSD2734GEQ Adaptive Defrost
« Reply #4 on: September 28, 2013, 04:05:19 PM »
And the ohm reading on diagram is 240 k thousands.i know heater is about 24 ohms because i just change one the other day not because it was bad but all bent up and the adaptive defrost was bad.

Offline dab147315

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Re: MSD2734GEQ Adaptive Defrost
« Reply #5 on: September 28, 2013, 04:13:10 PM »
Maybe a loose connection on one of the connections in there that you have to disconnect when your installing board.I guess these are F.S.P parts too?

Offline jason1979g

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Re: MSD2734GEQ Adaptive Defrost
« Reply #6 on: September 28, 2013, 04:13:44 PM »
the resistors/diodes get really worm on the lower right side then i have it plugged in i noticed.

Offline jason1979g

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Re: MSD2734GEQ Adaptive Defrost
« Reply #7 on: September 28, 2013, 04:15:21 PM »
i checked all the connections more then once. i even ohm out each wire. all checked good.

Offline dab147315

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Re: MSD2734GEQ Adaptive Defrost
« Reply #8 on: September 28, 2013, 04:15:50 PM »
You turn power off before installing board.I know its a basic question.

Offline dab147315

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Re: MSD2734GEQ Adaptive Defrost
« Reply #9 on: September 28, 2013, 04:17:43 PM »
So the unit is dead and not working unless you jump out wires is that correct?Meaning compressor is not running.
« Last Edit: September 28, 2013, 04:18:18 PM by dab147315 »

 

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