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

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Thermostat problem We recently installed a new thermostat. The heat does not come on now. We suspect that a wire is broken in the wall leading to the furnace. How do you replace the wire for that zone.

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Buy some more thermostat cable with the same number of conductors inside it that you need. Twist the wires in the wall to the conductors on the new cable you just bought. Wrap the connections with electrical tape and pull the new cable with the old cable, starting at the furnace. You will then have all brand new conductors to fit to your new thermostat.

Posted on Jan 12, 2009

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I have a Dometic DuoTherm AC/furnace in my RV. Thermostat got knocked off the wall. Now only thing that will work is the fan in the Manual mode. Heat nor air will come on. What could this be.


If you have properly re-attached all the wires to the old or newly installed thermostat, then I would suspect that one or more of the control wires to the heat pump have either been severed or pulled loose from the heat pump.

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Thermostat won't keep furnace fan running


You probably have a loose or broken wire to the fan relay. Check the wires on the thermostat first. Pull up on the bottom of the thermostat to remove it from the wall plate. You should see several screw terminals and the conductor wires that should be connected to them when you look at the wall plate. Check if any of the wires are disconnected or broken. If a wire is broken, strip a portion of the unbroken section of the wire and secure it to the appropriate screw. (The fan relay terminal is G for most setups.) If none of the wires are loose or broken, then you have to check for damage to the wires between your heating system and the thermostat or at the heating system. It could be a bad wire going to the jumper on control board or damage to the board itself.

I hope this helps. If the problem is not at the thermostat, you may need to have a professional diagnose and fix the problem. However, if you post additional comments about your heating system, Fixya experts may be able to help you diagnose the problem.
Cindy Wells
(we had the broken wires at the thermostat keeping the fan from working in the past. It's an easy fix if you are willing to handle small wires carefully.)

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1 Answer

No temperature control in Oven, even with a new thermostat


If you are certain that is wired correctly, and is the same as the old one, having made sure you have got the sensor located correctly,then it should click off the element at the set temp.

If it does not, then that leads me to suspect that the new stat is either faulty, or the wiring is not as it should be,I do not forsee any other reason for it not to cut out.

Jan 16, 2010 | Ovens

1 Answer

I'm replacing an old thermostat with a new Honeywell RTH6300B programmable. I have propane heat and central AC. My old thermostat has a black, a red and a yellow leads with no ID on the old thermostat wall...


Open up the propane furnace and see what color wires are hooked to the gas valve or circuit board. If it has a circuit board, note which color is on the R terminal and W terminal, Connect the the thermostat the same way. Most likely the yellow wire powers your A/C so you can hook that one to the Y terminal.

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1 Answer

How do you install a 2 wire heat only honeywell thermostat?


TURN THE POWER OFF. You need to be sure that the thermostat is made for the control voltage of your furnace. If the new thermostat has mercury contacts it has to be level to be accurate. One wire would be connected to the R terminal of the thermostat sub base and the other wire would be connected to the W terminal on the thermostat sub base. Seal up the hole in the wall where the wires pull through so cold air does not effect the thermostat. If the thermostat has an adjustable heat anticipator you will need to check the amp draw through the thermostat to set the anticipator properly. If you do not have an amp meter I would start out at a .4 amp setting and see how the thermostat cycles.

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2 Answers

GE P7 Wall oven had bad thermostat????


IF YOUR HEATING ELEMENT IS GETTING ORANGE HOT, AND CYCLING, I WOULD SUSPECT THE THERMOSTAT TO BE THE SOURCE OF THE PROBLEM. YOU MAY FIND IT HARD TO FIND ONE THOUGH DUE TO ITS AGE.

Jan 28, 2009 | GE JKP50SH Electric Double Oven

1 Answer

Have a 4 wire ac/heat system, installed new thermostat, cannot reconnect them as the leads were not labeled and the old thermostat was broken


Give me the the model number and Mfg of your equipment along with the color codes at the unit, not the thermostat wire at the thermostat, and I can assit. Contact me directly.

Richard (Rick) Drennan
Global HVAC Distributors
Field Support Representative / Instructor
rdrennan@globalhvac.com
900 Spreckels Ave
Manteca, Ca. 95336
Office (877)448-7263
Cell (209)456-0513

Jan 05, 2009 | Heating & Cooling

1 Answer

Frequent cycle times on my home furnace


There are a few things that can cause this problem. The most common is the hole behind the thermostat for the wiring was not covered up when the thermostat was installed. The thermostat will sense the air in the wall space or the basement if it is open to the back of the wall supporting the thermostat. Turn off the power to the air conditioner if attached and the furnace, remove the thermostat from the wall and seal up the wiring hole with duct tape. Insure the thermostat is mounted level when reinstalled. The thermostat should be mounted to sense the return air to the furnace, if the stair well leads upstairs, warm air rises, so keep the upstairs close to the same temperature as down stairs or move the thermostat and install a door to block air movement to the upstairs. There is a heat anticipator on the thermostat, the setting for it is in the installation manuel. For most gas furnaces it is .8. It is very easy to short out the thermostat when making this adjustment, so always have the power off.

Nov 26, 2008 | Honeywell Electronic Programmable...

2 Answers

Wiring on thermostat tl7235a1003


OK, here's my guess at this...I hope someone more knowledgable will confirm or correct me.

A line voltage thermostat switches the power to the baseboard heater. In other words, it's just like a wall light switch except it activates and deactivates based on the temperature.

I think your old model CT62 was wired exactly like a light switch. The hot wire to the light is broken then run to the wall switch and then back to the light so there's no neutral wire at a light switch box. This worked fine for your CT62 because it did not need power, it only needed to switch it.

The new model TL7235A1003 requires electrical power because it's programmable so you need both a hot wire and neutral wire at it's installed location. In addition you also need 2 wires leading to the baseboard heater so the thermostat can supply it's power.

I believe L1-L2 are to be connected to the hot/neutral wires, and the Load wires go to the baseboard heater.

If I am correct you will not be able to use this thermostat without some re-wiring.

Good luck.

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