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

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Hi, I installed the RTH2308 thermostat and it is turning the heater and a/c in reverse. Example: it is 75 degrees in the house and if I turn it to cold and down to 70 the heat comes on and if I turn it up to 80 and heat the a/c goes on. Help please. Thanks, Aaron

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Most likely you have the W wire and the Y wire reversed when you connected the wires at the thermostat. Try switching them around and se if that solves your problem. The W terminal is for heating and the Y terminal is for cooling.(both at the thermostat and your furnace). Make sure you turn the power off at your furnace before you change any wiring connections, if you don't you could short to grond and ruin the step down transformer or blow the low voltage fuse in your furnace. Hope I was able to help you!! Take care!

Posted on Nov 16, 2009

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I cannot say for sure because I really should have more info. to get it right for sure but I think that you have the "W" and the "Y" wires switched. Typically the W (heat) wire will be the white one and the Y (cool) will be the yellow one. Try taking off the wires in the t-stat from these two terminals and switch them. If this is a heat pump and take the wire you have on the B or the O terminal and move it to the other one the B and the O terminals determine heat/cool mode in a heatpump t-stat.

Posted on Nov 16, 2009

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1 Answer

I turn my heater on, it is set on auto, but it never turn off, it's a new thermostat.


If the setting was at 80 degrees and it didn't turn off, that's because the room didn't reach 80 degrees yet. Keep track of the room temperature as well as if it turns off when set for a lower temperature.

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As to your question 'will 75 cool the house?' The answer is 'yes' - if the outside temperature is low enough. Typically speaking you can expect your central AC to cool a properly insulated house to a down to a temperature of about 20-25 degrees lower than the outside temperature. For example - if the outside temp is 95 degrees. You could expect to get your house down to 70-75 degrees. If the outside temp is 110 degrees then you could only expect to get the house to 85 or 90 degrees.

So .. as you can see - your 'inside' temp will be directly affected by the 'outside' temperature.

As to the operation of central air; it is very simple.

I would suggest that you not pay 'too much attention' to what you have the thermostat set on. A comfortable temperature - is a personal thing - so - I would set it somewhere - say 72 and see how I (and others in the house) was handling that setting.

If you want it 'cooler' just 'notch' it down a degree or two - if you need it a little warmer - turn it up a degree or two. Do this "fine adjusting" till you have the temperature setting you are comfortable with.

Usually the more you can leave your thermostat alone the better off you will be from a comfort position and an electrical useage standpoint. Obviously, the higher you have your thermostat set the 'less' it will cost you on your electric bill.

How high you set the temperature is a balance you have to come to based on how comfortable you want to be - matched with how much you want to hold down the electric bill.

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Are you saying that the temperature over-shoots it's setting by 5 degrees? If so and if the thermostat has an inticipator device in it you can adjust it. After removing the cover on the thermostat, look for a little brass triangle on the lower right hand side. There will be a scale with numbers on it and they are very hard to see. This device heats up prior to shutting off the thermostat so it will not over-shoot by more than a few degrees. Move the brass triangle either up or down and let the heater cycle a few times. If the temperature swing gets worse, go the other way next time.

If the thermostat is not heat inticipated, there will be a small "Dip" switch where you can adjust to a specific degree of under-shoot.

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