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Problem wiring new thermostat - Heating & Cooling

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9 TIMES OUT OF 10 YOU PLACE THE COLORS ON THE TERMINALS MARKED W/ THE WIRE COLORS. BUT YOU SHOULD LABEL THE WIRES TO THE CORRESPONDING LETTERS ON THE OLD THERMASTAT THEN PLACE ON SAME LETTERS ON THE NEW. HOPE THIS HELPS EX. YELLOW (Y) RED (R)

Posted on Nov 16, 2008

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Posted on Jan 02, 2017

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It depends on the type of thermostat you have.
Do you have a 4 wire or 5 wire T'stat?
The red jumper wire was for a 5 wire t'stat with 1 transformer, the red jumper actually should have been from R to 1.
So you need to trace the wires back to the furnace and make sure they go to the locations identified below.
if you have a 4 wire t'stat then you don't need that jumper, if you have a 5 wire t'stat then you do need that jumper but it should go from Rh to Rc.
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t'stat?

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I am replacing old 220 volt thermostat with a programable 220 volt thermostat. There are 6 wires in the box. (3 black & 3 red) There are only two black wires on the new thermostat. On the old...


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