thermostat will not come on

by Jackie
(Annapolis, MO)

Model Tranquility 30. new install and can't get anything to come on. all power is hooked up but panel that sends power to thermostat does not have any juice.

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Oct 23, 2014
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No control voltage
by: Ex-HVAC Instructor

Suspect the fuse that protects the 24Volt transformer is blown OR the transformer is blown if not fuse protected. That's easy to do if the high voltage to the unit that contains the transformer is not turned off before you do any work on the low voltage system.

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