Question about Honeywell Programmable Thermostat Heater

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Honeywell RTH230B I am trying to install a Programmable 5-2 thermostat, but my current thermostat has six wires. Please advise

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  • brittany1bra Sep 21, 2008

    I had a 6 wire honeywell, i bought the rth230b and have no idea where to put the wires. Can someone post a diagram?

  • Anonymous Nov 02, 2008

    I have the same problem. I have six wires and this thermostat only allows for five. What do I do with the Blue wire?????

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This my situation exactly.  Changing from a 6 wire manual round Honeywell thermostat to a 5 wire Honeywell programable.  Is there a way to maintain all functions?

Posted on Nov 25, 2008

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Posted on Jan 02, 2017

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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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