Question about Honeywell Programmable Thermostat Heater

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Thermostat wiring what do i do with the blue wire? and where does the red one go. do i leave the jump wire in?

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Thermostat wiring depends on which thermostat you are using. The blue wire is typically used for the 24v common. The red is your 24v power. If you have one transformer you will jump RC and RH.

Posted on Feb 17, 2009

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If it was me I would make sure the weed wacker hadnt attacked those wires as they leave the area leaving the house making their way to your condensing unit. Next, follow those wires back to your furnace control terminal area. Blower vibration can cause those little wires to break over time. Take care not to cause a break. Next, pull the thermostat off its base wall mount and jumper the red and the yellow wire, sometimes there is a blue color wire instead of yellow. If the unit outside comes on after this trick, make sure rc and rh are jumpered together on the thermostat terminal base and if they are then its your thermostat. One last thing, if someone has changed that thermostat since last cooling season, the thermostat wiring should be red to r terminal, white to w, green to g, blue or yellow to y terminal. Again rc and rh are usually jumpered. There are exceptions and at the very least see that the red wire is under the rc terminal.

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I am trying to hook up a Hunter 44260 t-stat. The old one(not sure of model) has the following hookup. White-O Terminal Green-G Terminal Red-RC Terminal Yellow-Y Terminal then jumped to W Terminal...


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The 2nd combination is correct (w/ jumper). Wire nut or tape the blue wire. The snow flake shows it's going into cooling mode after a 5 min delay. If the AC is not coming on then the problem may not be the thermostat. If you don't have 24VAC between the red wire and the blue one the problem is at the furnace or it's supply. If you do, then check for 24VAC between the blue wire and Y on the thermostat(after the 5min delay) - if it's there the thermostat is calling for cooling. To check the heat, switch the thermostat to heat mode and use the W(instead of Y) on the thermostat(after the flame stops flashing).

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put the jumper back in RC and RH and that should do it.

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Normally, you should have 5 color wires: W-White, Y-Yellow, G-Green, R-Red and C-Blue.

The Blue wire is a common from the transformer on older systems, which is probably hooked to RC terminal.

Try this: Remove the blue wire and jump the RC to RH with the red wire and you will be fine. Blue wire should not be needed with the new thermostat.

This should also be stated in the instruction manual.
Hope this helps.

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