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

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We replaced an old thermostat with a newer model and all of the wiring seems to be correct yet the unit is heating when it should be cooling. How do you correct this problem?

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MAYBE YOU CROSS THE WIRE

Posted on Jul 02, 2008

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MY WHITE ROGERS THERMOSTAT DOES NOT HOLD THE TEMPERATURE AS DIRECTED. I COME HOME FROM WORK AND TEMP. IS 5-8 DEGREES BELOWW SETTING . I TURN IT OFF AND BACK ON AND IT WORKS FINE. THIS DOES NOT HAPPEN EVERY...


Your post didn't mention the Tstat model, if it is new or existing, what if anything might have changed near the tstat (new appliance, ceiling fan in the area) and so on. If it's new and wired correctly and the old one worked fine in the exact same mounting location, then it could be as simple as a defective tstat. If it's existing it could still be defective. On simple systems the tstat control lead for cooling turns on the condensing unit outside and the air handler inside, while the heat control lead on a non-heat pump unit turns on the air handler and heat strip. Newer systems split up the inside and outside units and control them separately to be more efficient. I don't know if you're having an issue with the heat or cool mode. If it's not the tstat then you will likely need to have a trained professional evaluate your system for system issues. Home depot carries Honeywell which Trane uses in their residential systems. Smart tstats are appearing now and while they have their advantages, putting one in an old system would be like putting a new Porsche engine in an old car with the original legacy transmission, so to speak.

Dec 06, 2014 | Heating & Cooling

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Hunter thermostat


Make sure that your room temperature is lower than your desired final heating temperature (or higher than your cooling temperature). Next check your wires to the thermostat. Some thermostats have screw terminals; others you push the wire into place after holding open a "lever".
A few months ago, we found that a few of the conductor wires had broken behind the thermostat. On stripping the insulation from the unbroken section of those wires and reconnecting them to the thermostat, it worked fine. There are 4-5 wires behind the thermostat, the wires that control the relays to turn on and off the heating and cooling are different from the power wires.

Next check your system. Change the filter and make sure that the door over the filter is closed. If it isn't seated, you may get a fail-safe over-riding the controls. Some newer systems will have LEDs that give trouble codes. Refer to your manual if you see any lights/code numbers. You also should check the wiring at the furnace/heat pump/AC unit. Another possibility is that the control board for the unit is damaged. (This also happened to us - a close lightning strike caused a surge that destroyed a portion of the circuit board. Your unit should have a trouble-shooting section that tells how to test the system by bypassing certain jumpers.) If the problem is at the board, call a repair person. They'll probably have the correct part on hand if you give them the make/model when you schedule the service call.
Please add a comment with information about your heating and cooling system hardware and any trouble-shooting lights, if present, for additional assistance.

Cindy Wells
I hope this helps.

Cindy Wells

May 18, 2013 | Hunter Fan Company 5/1/1 Programmable...

1 Answer

Replaced Bryant T-stat model TSTATBBNB001 with Honeywell t-stat


Your original wiring configuration seems to indicate that you have an air conditioner (not heat pump) and either a gas or electric furnace. If this is the case you may need a different thermostat for your application.

Apr 21, 2010 | Honeywell Heat/Cool Thermostat

1 Answer

Installing 1 1/2 ton Weatherking Heatpump and ADP WAK351807P2 air handler 1 /1/2 with 7.5KW back up heat kit. Can't seem to get the thermostat hooked correctly. I understand the Weather King product...


O energizes the reversing valve when the thermostat is set for COOL. B energizes the reversing valve when the thermostat is set for HEAT.
The O/B is usually a orange or black wire.
You can't hurt anything if you choose O or B incorrectly. Hook one of them up and run the unit. If set for COOL and the unit runs cool inside it is correct. If set for COOL and the unit runs warm inside it is not correct.
If the inside temp is opposite from your setting change the wire to the other terminal.
Remember to disconnect power from the air handler when changing thermostat wires.
The defrost control board on the outside unit should be marked correctly for O or B.
Your thermostat may have a slide switch rather than a separate terminal.

Oct 30, 2009 | Weather King 10AJA6001AH Air Conditioner

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Installing a new termostat


Depends on the brand of unit you are running.
Brand and model number please.
Most are on "O".
Hook it to "O" and run the unit. if it runs correctly in Heat and Cool, you are OK.
If not switch it to the "B" terminal.

Apr 12, 2009 | Heating & Cooling

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Change thermostat


You have caught me without my old books, but I can tell you the orange wire is for the reversing valve on a heat pump. Almost all manufacturers, except for Lennox, are: R=Power (24volts), G=Indoor fan (Blower), Y=Cooling (A/C), and W=Heat. Some t'stat's are set up to use 2 separate transformers (24 volt), that is why you will see Rc, Rh. This is power for cooling and power for heating. If this is what you have, just take the Red wire and strip it back far enough to go under both screw terminals if the unit is a residential one. I've been doing commercial work for over 20 years and have never seen an "A" terminal, so I can't help you there. You may want to double check that. If I'm reading you correctly, I would put the orange wire on the "O" terminal. Don't understand why the "Y" terminal is not used. It turns on the compressor. The "O" goes to the reversing valve to "Tell" the outdoor unit that it is either in the cooling or heating mode.

Good Luck and let me know if I can help any further.

Feb 19, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell st7000


what type of system do you have? cool/gas heat, heat pump, electric cool & heat. split system or package unit?

Mar 14, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Replacing a thermostat


Typically if you are replacing a heat only thermostat you will have two or three wires. On the old thermostat these wires will be attached to terminals marked "R", "W" and maybe "G". Document what color wires goes to which terminal and transpose these to the new thermostat. If you have a heat and cool thermostat, you will have two or three more wires and connected to terminals labeled "C", "B" and "Y". Again, transpose these wires to the new thermostat as best you can.

Feb 12, 2008 | Honeywell CT87B ROUND HEATING&COOLING...

1 Answer

Hunter 44630 thermostat


Here is a link that will have wiring diagram it is for a similar model hunter. Also check your dip switch on the back of the stat to ensure it is set for gas (HG) or electric heat (HE) depending on your type of unit. Good Luck. Rule of thumb for most four wire systems is RED (power to stat) Yellow (Cooling) Green (Fan) White (heat)

Jan 12, 2008 | Hunter Fan Company 5/1/1 Programmable...

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