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Tempstar furnace when the thermostat is fan on the fan from the air compressor turns on not the air circulation fan in the bottom of the furnace

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  • mopar440man May 28, 2010

    what are the wire colors to the letters on the thermostat and air handler?

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Y or yellow and G or green are connected in the "auto" setting, as G is fan and Y is cool, the Y and G wires are somehow, energizing the Y wire that goes to the AC unit to run cool, take thermostat off exposing the thermostats sub base Y and G will be there along with R, red, 24volt ("hot leg" of 24 v power) W white= heat, and C common, 24 volt ("neutral leg" or "common" leg of 24 power) common is where all the various 24 volt circuits (cool, heat, fan,) terminate or return to complete the circuit, just as a AA battery nas a positive and negative side of power, so does the furnace and all electrical circuits, its common as all circuits terminate there , its the opposite side of power fro whish all circuits begin, red is the :hot leg" and enters on RED red to WHITE=HEAT

RED to YELLOW=COOL
RED to GREEN= FAN

auto =Y & G connected
on= R & G connected

if you jump red to green, which is fan on, no connection should exist to yellow in on ! only auto!

Posted on May 29, 2010

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1 Answer

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