Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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I recently installed a Honeywell RTH6350D to replace a 2 year old LUX and can get everything to work but the heat(reason for replacing the LUX). Works sometimes but not consistantly. Have the common red(R) with jumper to RC, white(W), yellow(Y) and green(G) wires in play but do have black, blue, brown and orange available but have always been taped off to my knowledge. Please advise to how to get the heat on consistantly.

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R represents power supply for the heat system.
RC represents power supply for cooling system.
G represents fan (neutral).
W represents heat system.
Y represents cooling system.
Y2 represents 2nd stage cooling.
W2 represents 2nd stage heating.
AUX represents heat pump.
Try calling 1-800-468-1502.
Their english is "REALLY BAD"!!!

Posted on Jun 09, 2011

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Try removing all wires but R and W. These are the only wires you need for heat. The others are to power the thermostat and AC. If the thermostat gives better performance, you have a drain from the other wires. Check to see if you have good connections at the furnace.

Posted on Jan 02, 2011

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