Lennox Elite Condenser will not turn on call for cool


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Old 05-13-14, 07:00 PM
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Lennox Elite Condenser will not turn on call for cool

My AC outside unit is not working. Here is what I tested:

(1) On the outside unit I do not get 24v across the contactor. When I manually press the contactor the unit is working.
(2) On the control board (surelight), I do not get 24v on Y and C when call for cool. I think I should get 24v, shouldn't I?
(3) The (indoor unit) blower fan works when call for cool.

What else can I check? Is this a bad compressor relay on the control board?

Thanks!!!
 

Last edited by katgoo; 05-13-14 at 07:15 PM.
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Old 05-13-14, 07:07 PM
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On the control board (surelight), I do not get 24v on Y and C when call for A/C
The thermostat is where the Y wire gets its 24vac from. You have a thermostat problem or break in the Y wire. You can try connecting Y to R at thermostat to see if the compressor comes on.
 
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Old 05-14-14, 06:41 AM
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PJMax - you are the best! MANY thanks. I misread a wiring diagram...

It was a disconnected thermostat wire at the control board terminal: the exposed part was still connected but the rest of the wire was hiding from me when I first looked :-)

Easy fix. Thanks again. This board is awesome!
 
 

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