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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Replacing thermostat what to do with single red wirew/bridge?


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I have the honeywelL RTH111 and also had an old thermostat with only two wires...... the manual says to just hook the wires to the same letter slots as it was in the old thermostat..... i did so but the...


Hook up the red wire to Rh (or Rc if they are jumped together) amd the white wire on W.

For thermostat terminal designation
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RTH6400 Honeywell - where does the blue wire go. There is also a yellow wire. How do I connect the red wire when there is a wire clip going in the place marked R & RC???


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1 Answer

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1 Answer

Want to replace manual thermostat with programmable.


you can use a 5 wire heat pump thermostat.

Must be heatpump thermostat
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1 Answer

Honeywell RTH 230B Thermostat Wiring


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

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3 Answers

Honeywell RTH230B


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.

Feb 03, 2008 | Honeywell Programmable Thermostat Heater

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