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

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I'm installing a Honeywell Thermostat RTH2410. In Step 1 you need to identify the system type. I have a Carrier Heat Pump model FA4BNF030. Is this a heat pump with or without auxiliary/backup heat?

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Brandon Berry

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Auxiliary heat is electric heat that is put into the air handler on the inside of the house. Its used when your heat pump doesn't provide enough heat, but heat strips are not always used. To see if you have auxiliary heat, look inside and see if you have breakers on the front panel of the air handler or anywhere close. No breakers, no electric heat. Hope this helps!

Posted on Dec 12, 2010

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How do you program the Honeywell RTH 2410B1019 thermostat for a heat pump.


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Look real good at the terminal block. Look at both the left side and the right side of the terminal block. O should be there! You probably do not own a heat pump. Also have patients when programing the thermostat!

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Your system has 2 stages of heat. Therefore you should have a 2 stage tstat. The 2510 is 1heat/1cool, put your w2 wire in with your w1 wire, you will be fine.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

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you likely have a "two stage" system, but not a two stage heat pump. the first stage is probably the heat pump itself, and the second stage is the auxilliary resistance heat that suppliments the heat pump at lower temps. if i knew the terminals that are available on the new stat, i could advise you on the proper wiring.

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You probably have the wrong wire on the R terminal. Make sure that the wire on the thermostat R is the same wire that is on the furnace R terminal.

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1 Answer

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The Honeywell RTH2310B is a standard thermostat and is not compatible with a heat pump system. The terminals O and E are for a heat pump system. I am assuming that the terminals you described that do not match are from the old thermostat. What you will need to do is get a heat pump thermostat. Sometimes it can be hidden within a lot of other descriptions on the front of the box, but it will say heat pump and either 2 heat/1 cool or 2 heat/2cool. You should just need the 2 heat/1 cool heat pump thermostat. Hope this helps.

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I Have a honeywell RTH2410 Thermostat I wired it without the blue wire which used to go to X on my old thermostat. Now it comes on with aux heat all the time and I have a Heat Pump. How can I fix this?


What was the old thermostat labels and the wire colors that went to them?
The typical heatpump wiring Terminals are:
R = Red = Hot side of Transformer
C-B-X = Common side of transformer Depending on brand of heatpump
Y = Yellow = Cooling Contactor
G = Green = Furnace Blower
O = Orange Reversing Valve Energize to Cool
B = Blue Reversing Energise to Heat Depending on brand of heatpump.
W2 = White = Auxiliary Heat
You need to be sure where each wire comes from when you connect them to the new thermostat.
The best way to do that is to go to the furnace and see where they are connected. R-Y-G are probably correct, you need to see where the Blue wire comes from and determine what the X terminal was on the old thermostat.

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Hook up o to o/b, then in the installation programming set the change over valve to energize in cool. Then hook up w to aux. Good luck.

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