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Old 10-12-2009, 02:45 PM  
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Default Thermostat Wiring Blue 4M

I am trying to replace my old style thermostat with a new Honeywell.

My old wiring setup:

Green to G-F
Yellow to Y-C
Red to R-V
White to W-H
Blue to 4-M

That is the labeling on my old thermostat.

My new thermostat has the follow labels:

W Y G R Rc

There is currently a jumper for R and Rc they say to remove if you use Rc.

Both heat and HVAC are electric. No heat pump as far as I know.

So where does the Blue wire go? Rc?

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