[craig jasgur]

there is power to the low voltage panel but it doesn't turn on.

[thisnamebetternotbetaken]

when you say low voltage panel, are you refering to the inside or outside unit? Does the blower come on? You may have a bad transformer. Do you have a multimeter?

[Icehouse]

Originally Posted by craig jasgur

there is power to the low voltage panel but it doesn't turn on.

How are you determining this ?

[mkennedy]

I agree with Icehouse - where are getting this info?

Are you reading 24 VAC at the low voltage board (where the t-stat wires come into the unit). Is this a split system, package unit, or wall mount?

If you are getting 24 VAC, then it is most likely not the transformer - you can't get low voltage without first having high voltage (120/240/277 etc). If this is a split system or a package unit I would look at the contactor first. I have a had a few situations like this where it was a bad contactor. If you feel comfortable doing this you can manually energize the contactor to see if the unit runs fine when it is engaged (you may want to use an insulated screwdriver just in case). If you do manually energize the contactor and the unit turns on, then you have a problem with the low voltage coil and need a new contactor.

[Icehouse]

Originally Posted by mkennedy

I agree with Icehouse - where are getting this info?

Are you reading 24 VAC at the low voltage board (where the t-stat wires come into the unit). Is this a split system, package unit, or wall mount?

If you are getting 24 VAC, then it is most likely not the transformer - you can't get low voltage without first having high voltage (120/240/277 etc). If this is a split system or a package unit I would look at the contactor first. I have a had a few situations like this where it was a bad contactor. If you feel comfortable doing this you can manually energize the contactor to see if the unit runs fine when it is engaged (you may want to use an insulated screwdriver just in case). If you do manually energize the contactor and the unit turns on, then you have a problem with the low voltage coil and need a new contactor.

Better yet call a "Qualified" technician.