Question about Carrier XHB123D X/Y Series Heat/Cool Air Conditioner
Check the transformer. Remove the thermostat face and use a voltmeter to check for 24vac between the R terminal and the C terminal. If it's not there check for power on the transformers primary and secondary sides. Replace the transformer if you have power on the primary and none on the secondary. If you don't have any on the primary you should look for a fuse or another circuit breaker.
Posted on Sep 13, 2010
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Posted on Jan 02, 2017
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