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

1 Answer

I am trying to install a programmable thermostat. The old stat had 6 wires connected to it, I will list the terminals, followed by the wire color: C-Light Blue, E-White, R-Red, G-Green, O/B-Orange, Y-Yellow. There was also a toggle switch, set to O (not set to B). I hooked up a new stat, which has Rh and Rc jumped - Red wire, W-White, Y-Yellow, G-Green. I did not connect Blue or Orange wires, taped them off. When the stat calls for heat, the gas intake fan starts running, but I get a 3 blink error message on the furnace - Pressure Switch Stuck Closed. I have taken the new stat off, put the old one back on, and the furnace runs fine. I'm trying the new one again, and I get the same error. I have a gas furnace, only one temperature sensor at the thermostat. The wiring on the circuit board of the furnace is as follows: R-Red, C-Dark Blue, W-White, Y-Yellow, G-Green. (Also, there is an orange wire connected to the green but not connected to the board). I called Honeywell, they had me change the new thermostat programming, and said my wiring was correct, but it still doesn't work. There is a jumper switch on the thermostat and it is set for a gas furnace vs a heat pump. Any help would be appreciated! I'm certain there is nothing wrong with the furnace or the pressure switch because it works fine with the old thermostat. But I have two wires that are unconnected to the new stat, and I think one of them might need to be connected to something.

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  • kavaea Oct 04, 2009

    Actually there is A/C as well. I'm reluctant to disconnect anything from the furnace, because it works correctly when the t-stat is wired correctly.



    Is it possible that I should remove the t-stat jumper, connect the Red wire to Rh and connect the Blue wire, (which is connected to C on the furnace circuit board) to the Rc port on the stat? That will leave the orange wire unconnected.

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Disconect the dark blue on the circuit board of the furnace. if there is no central air the c terminal was powering the old t-stat

Posted on Oct 04, 2009

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