Question about Honeywell Programmable Thermostat Heater
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.
Posted on Feb 03, 2008
The MacGyver solution above worked PERFECTLY. The blue wire is not needed in older systems and the problem can be solved by using the red jump wire. Just place the red jump wire around the red RH wire and insert the other end in the RC terminal and it will work. Great Forum!!!!
Posted on Apr 06, 2010
I have a similair problem with this controller. I have a 5 wire coming from my wall. 2 of which goes to heating which runs fine. The 3 wires (red, white, and green) should somehow go to cooling but thus far I can only turn the fan on and off. Any help??
Posted on Jul 01, 2008
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Posted on Jan 02, 2017
You probably have a loose or broken wire to the fan relay. Check the wires on the thermostat first. Pull up on the bottom of the thermostat to remove it from the wall plate. You should see several screw terminals and the conductor wires that should be connected to them when you look at the wall plate. Check if any of the wires are disconnected or broken. If a wire is broken, strip a portion of the unbroken section of the wire and secure it to the appropriate screw. (The fan relay terminal is G for most setups.) If none of the wires are loose or broken, then you have to check for damage to the wires between your heating system and the thermostat or at the heating system. It could be a bad wire going to the jumper on control board or damage to the board itself.
I hope this helps. If the problem is not at the thermostat, you may need to have a professional diagnose and fix the problem. However, if you post additional comments about your heating system, Fixya experts may be able to help you diagnose the problem.
(we had the broken wires at the thermostat keeping the fan from working in the past. It's an easy fix if you are willing to handle small wires carefully.)
Posted on Jul 06, 2013
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