I have 4 wires. The white to the W, the blue to Y, the green to G and the red to R. The fan is running, but I can't get heat and there is still no display on the thermostat. Why would the fan be running even when it did not receive any signal from the thermostat?
SOURCE: changed honeywell T8400C 1024 to
Hi,
On the t-stat and the furnace make sure the wires are hooked like this...
Red to R
White to W
Green to G
Yellow to Y
Blue to C
then it should work..
Thermostat Wiring and Terminal Designations
heatman101
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