Well, you could check for power at the compressor. Since the T-stat switches
run the air handler, that's got power.

--

Christopher A. Young
Learn more about Jesus
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"B" wrote in message
...
Please give me some basic guidance on diagnosing home AC system. The display
on the electronic thermostat went dark, but the batteries aren't dead. The
on/off switch on the thermostat can still start the air handler in the
attic, but the outside compressor won't run. The breaker did not trip off.
There was a lightning storm. What can I do before calling the repairman?
Thanks. -B