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Old 05-28-2012, 08:19 PM   #1
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Will bad blower control board keep compressor from coming on.


Have no air conditioning whatsoever. It is a single compressor with two zones controlled by dampers and a zone board. I suspected the zone controller board since it fails frequently and i was right. Wired upstairs thermostat to equipment to at least have ac upstairs but am getting nothing. The thermostat is calling for cooling but the unit is not coming on. I took the door off the furnace unit and found no diagnostic lights lit on the surelight board. There is 120V to the board but nothing happening. I took off the surelight board and there is a badly burned spot on one of the traces on the back. My question is will this prevent the outside unit from coming on. I can manually press the contacter and the outside unit comes on. I am going to replace the zone controller board and the surelight board but want to make sure that i shouldnt have any other issues. Thanks in advance for any help you can provide.

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Old 05-28-2012, 09:45 PM   #2
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Will bad blower control board keep compressor from coming on.


it could....

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Old 05-28-2012, 09:45 PM   #3
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Will bad blower control board keep compressor from coming on.


Yes, board is bad and will not be able to direct any low voltage control. Might want to check the transformer as well.
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