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View Full Version : Old 4 wire furnace no ac to it and basic 2 terminal thermostat! HELP


meesh1902
Oct 18, 2013, 08:26 PM
I have 4 wires, red, yellow, white, green.. took off the old round thermostat because it was cracked.. it had no letters labeling the wires! I bought a Honeywell simple thermostat for heat only, it has 2 terminals W and R.. Its cold here in Chicago and I really can't afford a heating call.. HELP!

WallyHelps
Oct 22, 2013, 06:00 PM
There is a color code for thermostat wires, and if the original installer followed that you would hook the red wire to R and the white wire to W. You only need R and W for heat.

Hope this helps,
WallyH