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Discussion Starter #1
I am replacing a SimpleComfort 2200 with a Honeywell RTH3100C and need help with the wiring.

Here is a picture of the SimpleComfort unit:

And here is the connector for the Honeywell:

Can anyone help with the wiring? It's cold out baby!


I'm Your Huckleberry
5,884 Posts
R-24 volts (red wire)
O-reversing valve for heat pump (brown wire)
C-common (blue)
G-fan (green wire)
Y1-Cool (yellow wire, will go to Y on new stat)

All the above will be like for like.

W2-heat (will go to aux on new stat)

Turn the breaker to the furnace off first as you stand the chance of blowing a fuse, transformer or possibly the board.
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