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Where does the blue wire go on the Hunter thermostat 42995B

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  • itsmechristi Jan 02, 2009

    The house was built in 1985/1987 and I believe the furnace is original with the house.

    The old Thermostat did not have batteries, however, the new one (Hunter Thermostat) does.

    The wiring in the wall is Green, White, Blue & Red

    The Thermostat Terminals are Green, White & Yellow and have a Red jumper wire connected to the RH & RC Terminal.

  • ami35miller1 Mar 22, 2009

    im changing my honeywell thermostat ( mercury) for hunter 42995bdont know how to wire .old wiring is white/w2,orang/o,blue/b,yellow/y1,green/g,red/r,the new one is marked g,w,y,rh/b,rc/o pleas help

  • Stephen Evans May 11, 2010

    How old is your furnace and does the thermostat have batteries? Steve

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Since the new thermostat has batteries you no longer need to use the blue wire if it goes to common.

Posted on Jan 02, 2009

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Without further info, the blue wire is normally the common wire, and connects to the terminal marked "c". It's best to check the terminal board at the unit and match up the colors and letters that way.

Posted on Jan 02, 2009

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