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My programmable "Carrier"

My "Carrier" Programmable Digital Thermostat stop working. No LED light or display. Whats wrong?

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  • marty metzger May 11, 2010

    thermostat have battery?

  • Mark Egan May 11, 2010

    The problem may not be the thermostat, but the furnace.

    Check that all side panels are properly fixed in place. The blower access panel has a safety switch on it to prevent operation of the blower. This also kills the 24VAC to the thermostat.

    Please reply if this is a gas or electric furnace, and if you have a heat pump. Also, if you know if this is a 2 transformer system (no looping between TH and TC on the thermostat sub base)?


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  • 6 Answers

Blown fuse on circuit board, or transformer dead, or hot (red) wire disconnected or broken somewhere in circuit.

Posted on Feb 16, 2009

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