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re: A/c issue after lightning strike. Any help appreciated

Posted on 3/16/19 at 9:28 pm to
Posted by Miketheseventh
Member since Dec 2017
5823 posts
Posted on 3/16/19 at 9:28 pm to
This sounds like the most logical answer. It doesn’t take much of a voltage spike to fry those control transformers
Posted by upgrade
Member since Jul 2011
13177 posts
Posted on 3/17/19 at 9:08 am to
Check for power feeding control transformer. Then check for power on the secondary side.


Think of the transformer as a way to divide the problem.

If there's power on both sides it may be the thermostat. Or something else on the low voltage side, and you can rule out the high voltage problems.
If there's no power on either side look for a tripped breaker or blown fuses. You have a high voltage problem to solve first, and then possibly a low voltage problem to solve after.
If there's power on the primary side of the transformer but not the secondary, the transformer is bad. .



This post was edited on 3/17/19 at 9:24 am
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