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We put in a new thermastat and now the ac wont work. Is there a fuse?

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R--redwire-power y-yellow wire -cool g-green---fan w-white -heat. If you turned it off &back on too fast, then you probably did blow the fuse on the outside unit or triped a breaker, check your fuse box ,or on the outside wall, theres a gray box called the disconnect box that sometime, house 2- fuses or a plain pull-out with no fuses.

Posted on Sep 04, 2008

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My ac comes on for a second or not at all. Changed thermastat but is still doing it. The fan works fine and so does the furnace


APPEARS TO BE AN ELECTRICAL ISSUE=CHECK YOUR POWER-SINCE YOU HAVE 2 AC UNITS, I ASSUME 50 AMP SERVICE. FURNACE IF GAS POWER BUT ELECTRICAL FAN DOES NOT REQUIRE A LOT OF ELECTRICITY. CHECK ELECTRICAL FIRST. WHY DID YOU REPLACE THE THERMOSTAT?? ARE YOU SURE OF YOUR THERMOSTAT WIRING? WAS IT AN IDENTICAL REPLACEMENT UNIT?

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1 Answer

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2 Answers

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Heat pump Thermastats have Terminals RYW/OW2 G C. I run into this a lot with people buying tStats at home depot. To wire three sages of heat you must have correct tstat. one stage cool and three stage heat. You have to have enough wires at the Tstat. I use white first stage brown second and grey or black third. Make a diagram where each wire goes. Remember to trun of air handler power or you will short the transformer or blow low voltage fuse. Yellow cool, green fan, most of the time blue is c unless it is a battery tstat. orange is O. Red R ot power wire. Rusty

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1 Answer

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1 Answer

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May 08, 2008 | Air Conditioners

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