Question about Honeywell Programmable Thermostat Heater

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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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SOURCE: honeywell rth230b won't shut off heat

Sounds like a relay sticking. Possibly in the thermostat or possibly the furnace relay at the furnace. The next time it happens, unplug the thermostat from the wall. If the furnace still runs then it's the furnace relay.

Hope that helps...

Geno

Posted on Mar 07, 2008

  • 1 Answer

SOURCE: Honeywell 5+2 day programmable thermostat will keep heating to 29 degrees!

Our Honeywell thermostat is model RTH6300B. Now that the weather is getting hot, we decided to put the centeral air on. Hot air keeps blowing out. I called Honeywell several times thinking that we had fixed the problem. It still is blowing out hot air. Also, my husband checked the wires. Has anyone else had this problem? Any ideas what it could be?

Posted on May 29, 2008

  • 1 Answer

SOURCE: tempstar dc90 furnace will not light

Possible solution would be to push the reset button if you haven't already. I have had to do it twice on my dc90 in the last week.

If you look at the glass where you can see the combustion chamber, the glass is oval, follow the long axis of the oval toward the 'top' of the ignition chamber (my unit is laying down, with the blower on the west end and the combustion chamber on the east, as I am facing south). On top of the chamber are two protected spade clips. In between them is the reset. Make sure that the unit is off, press the button, and fire it back up.

Posted on Feb 20, 2009

  • 2 Answers

SOURCE: new programmable thermostats will not operate the furnace or air

did u turn the power off to unit before installing t-stats,if not then mabe blown low voltage fuse

Posted on Mar 28, 2009

Therinnaiguy
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SOURCE: installed my thermostat and the heat keeps

Make sure red wire is on R terminal, white wire is on W terminal. Also look for a short in the thermostat wire.

Posted on Oct 17, 2009

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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.

Nov 13, 2014 | Heating & Cooling

1 Answer

Tempstar DC90 willnot shut off


I can't stand the tempstar smart valve! Now I'm not sure what a dc90, but if you have a gas fire residential furnace I know what it is. The smart valve controls gas and flame proving only. The blower issue is probably one of the high temp safeties that has stuck. During a call for heat, your system verifies that all safeties are closed. If this sequence is not correct, then the unit assumes that the unit has overheated due to a high temperature safety issue, and brings the blower on to cool it down, normally for 90secs. Also if the unit is calling for heat when the power is turned off, still calling for heat when power is turned back on(like you said by throwing the switch), this will also bring the blower on for 90sec, then blower will/should turn off, and the heat cycle will start. So if your tstat is calling for heat(heat on and set temp higher than accrual temp), and you turn off power then turn power(main voltage) back on, this will bring blower on for 90secs. Now, the burners staying on is a different issue. I've not seen that in 15 yrs of service on a smart valve. There is probably 24volts feeding the "W" circuit, for some reason. On the control board there is a terminal block with R W G Y C. The W is your heat. This W receives a 24v signal from your tstat. Turn off power, remove W from the board, then turn power back on. If no heat then you've isolated your problem to the control wire coming from your tstat, or the tstat itself. If it continues to heat with W disconnected then its something in the furnace, circuit board? Hope this helps!

Mar 04, 2017 | Null Heating & Cooling

1 Answer

I installed a honeywell CT87N thermostat. The


the burners light? if the burners dont light than it's working right the blower on the furnace comes on with the a\c

Jun 19, 2010 | Honeywell Electronic Programmable...

1 Answer

Furnace comes on after two or three minutes off.furnace seems to run to often.


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.

Mar 03, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

I have a Honeywell programmable thermostat with a York high efficiency furnace. To turn the heat on, the thermostat "clicks" and cycles the furnace through startup (warm the fire starter, turn on gas,...


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..

Feb 26, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

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

Jan 18, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

New thermostat honeywell RTH7400 cycles oil furnace every 10 min.


rth7400 maintains a 1 degree differential in temp so 10 minute cycles are not unusual.

Vinnie

Jan 02, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

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

Dec 13, 2008 | Honeywell CT3200 5-2 Day Electronic...

3 Answers

Honeywell 5+2 day programmable thermostat will keep heating to 29 degrees!


Is sounds like you wired it correctly, The black is a little unusual perhaps its blue, anyway, try disconnecting the wires from the thermostat and see if it shuts off. If so, then it may need to re calibrated. I will need some more info to help you anymore.

Dec 03, 2007 | Honeywell CT3200 5-2 Day Electronic...

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