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Thanks again for your response. You said to bypass the defrost board and jump 24v to the compressor contactor and I did. This makes the contactor pull in and start the compressor and fan. How do I know it's not the defrost relay that is the problem instead of the timer board before I spend $120 on a new board?

Submitted: 283 days and 19 hours ago.
Category: HVAC
Value: $9
Status: AWAITING CUSTOMER ACTION
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Posted by Drcool 283 days and 18 hours ago.

Info Request

hello,

Please indicate who answered your previous question and to what category did you converse.

This is the HVAC category and your problem sounded like a chiller or a freezer with a defrost cycle not functioning.

And if you can not contact your previous expert, and you want your question to be answered, you can explain again your problem and I can help you out if I can.

Posted by ComfortZone 283 days and 17 hours ago.

Answer

The board may be good and you have a bad high pressure or low pressure safety.

Answer

hello this is scott, can you trace 24 volts, yellow/compressor contactor , and common, does your low voltage from t-stat going outside go to the defrost board, but you don't have the 24 volts leaving the board, the defrost relays job is to switch reversing valve and energize heat strips. check that and let me know if that is what you have[ comp contactor] that should be yellowlow volt going into board but not coming out ,thanks

Expert: HVACguy
Pos. Feedback: 100.0 %
Accepts: 
Answered: 2/11/2009

HVAC Technician

I have 28 years experience in installation ,service, and design.

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