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Wall thermostat has no reading.

A new digital thermostat was installed two years ago by a pro. Worked fine until I tried to fire up the furnace for a "test run". I noticed there was no reading (Ambient temp)on the face of the stat? No on/off switch available on stat (dial). Checked the switch on furnace and reset breakers, still no reading. Took face off stat and its hardwired so no batteries to replace.
This is a gas furnace only, no a/c.
What is going on??

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  • Heating & Co... Master
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You must check for voltage at the stat. If voltage present with no display the stat is bad. No voltage, you gotta find out where it stops.

Posted on Jun 29, 2017

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Tou may ahve a two transformer system. On the sub base of the tstat there is tterminals rh and rc they come with a jumper wire between them. Remove jumper. Hook the two wires from your heat to rh and w. Hook the rest of the wires Red rc yellow to y green to g and blue or black to c. Thats it . Keep in touch and I will walk you thru this. Rus

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