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Old 11-12-2011, 09:17 PM   #1
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Furnace heats only with thermostat on Cool


Honeywell RTH2300 wired by instructions, NG furnace, elec AC, furnace ignites and heats with System Switch on "cool", does not ignite on "heat". Labeled or switch built backwards?

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Old 11-12-2011, 09:53 PM   #2
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Furnace heats only with thermostat on Cool


you've miswired it. take pics and post them of all wiring.

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Old 11-12-2011, 10:37 PM   #3
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Furnace heats only with thermostat on Cool


remove the stat from the subbase and tell us the olor of the wires going to the lettered screw terminals.....shut the furnace power before flipping wires up on the stat.....check this first should be R/RED (24V hot) Y/YELLOW(cool) W/WHITE(heat) G/GREEN(fan).....if you jump R to G-(fan) R to Y-(bump condenser ON) R to W (heat)
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Old 11-13-2011, 08:41 AM   #4
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Furnace heats only with thermostat on Cool


You've probably got the white heat wire on common, as common is used for cooling to bring on the condenser.
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