Question about Honeywell Programmable Thermostat Heater

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Blower cycling problem

Installed a honeywell programmable thermostat on a Tempstar dc90 furnace. When not calling for heat the blower cycles on and off constantly every 30 seconds

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Sounds like a relay problem!

Posted on Dec 08, 2008

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Tempstar DC90 pilot light or burner keeps going out. The furnace will run continuously. Even if I turn heat off at the thermostat. I have to kill power at the panel box to get it to shut off. Then I've...


The reset button near the ignitor is a high temperature limit safety switch. When the furnace gets too hot and the manual reset limit switch is tripped, it most likely goes into a 'safe' mode where the gas control is locked out electronically and the blower is made to run continuously to rid the heat exchanger of the excessive heat. This will continue until the reset is pushed and the power is cycled off. It will remain an endless cycle unless the reason for the overtemperature condition is not corrected.

Your furnace 'temperature rise' is getting too high due to a lack of air across the heat exchanger for whatever reason. Some of those reasons could be a restricted air filter or a blower motor that's cycling improperly on its internal winding thermostat. You could also have a dirty air conditioner 'A' coil (evaporator) on top of the furnace restricting the air flow. Nevertheless, you are going to have to have it serviced by a reputable service company's technician to correct what's wrong.

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If the blower only runs it is likely due to a dirty filter or too many vents blocked or closed. Sencondly if the furnace runs more than you remember before installing the new thermostat look for an adjustment (sometimes called heat anticipation) and select fewer cycles per hour, this will allow a little lower temperature before it comes on hence fewer cycles per hour.

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Well, it is a computer, and they all glitch, now & then, you say it clears with a power off, and thus resets it, It maybe a thermostat, flaking out, they do that, but the 6'o'clock, thing being the "Or" that sets it apart, I wonder if it isn't just a faulty control unit, as two together is too many, for a single cause, now, it sort of points there, but also, may sound silly but first, of there is any, Check your backup battery..

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I have a honeywell ct3200 with a trane xl 80 furnace. it will cycle on to the right temp, go off and cycle the furnace back on 30 seconds later. Is that normal? It is 32 degrees outside, set at 68


Hi, check page 22 in your manual, it says "Adjust the screws on the back of the thermostat as instructed on page 7." Your furnace is a 80% efficiency but is also a high efficiency 2 stage heating system so try adjusting screws A and B both ways and see which gives you the correct cycling.
Your manual is here:
http://customer.honeywell.com/techlit/pdf/69-0000s/69-0653.pdf

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I have a TH8000 Vision Pro. It is controling a


Whats' so hard is the Honeywell thermostat has a built in 1@ differential. It is not adjustable.
You might ask your installer about a time delay relay installed in the furnace to break the thermostat heat wire (usually white wire).
Most time delay relays are 90 seconds. But that might be enough to reduce the furnace cycling.

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Hi, You are right, fan is on a time delay in the heating cycle, and after burners fire that is when this delay comes into play. You have a preset factory temperature that determines the cycle on time for the fan, and the off time after the burners shut down also. This will not be in the thermostat, but in the fan/limit control the is mounted on the face of the furnace, with a probe inserted into the fire box.Depending on how old or new this unit is, will depend on the type control you have.It may be just a high limit switch, or the 1st I mentioned.If so, It rotates in the burner as the temperature rises, to turn the fan on and off.Disconnect power, remove cover, and 2 screws.Slowly remove the control and gently clean the probe. Turn the dial if this one has it and you will be able to hear it click. This click is contacts closing to start fan operation.Reinsert and try again. If problem continues, you will have to replace it.They do tend to stick closed/on, in the heat cycle from time to time and a cleaning sometimes will solve this problem. Not knowing how old this furnace is and type, make it difficult to give you a correct diagnosis, so check this fan control as I have explained, and if your system is of a different type, please let me no so I can correct this problem. Sincerely,
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Blower won't shut off on heat or cool cycles


Hi it souds like the afc is not working check the setings on it or clean the back of it /or replace

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