Question about Honeywell Programmable Thermostat Heater

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FURNACE CYCLING ON AND OFF ..

TEMP SET 68/' ONLY RISES TO 61"/ .. BURNERS FIRES GOOD FULL FLAME BUT SHUT OFF ,BACK TO PILOT STAGE JUST AFTER 2 MINUTES ..THEN COMES ON AGAIN IN ABOUT 3-5 MIN...EQUIPPED W/ TWO STAGE FAN ...WHICH BLOWS LOW CONSTANTLY, HOWEVER IT DOES BLOW HIGH COOL AIR FOR A COUPLES MIN. AND THEN .. FULL FLAME AGAIN ......

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It sounds like you have a dirty or faulty flame sensor im assuming that you have inshot burners in your furnace the flame sensor will be on the right or the left of the burner assembly opposite the pilot and ignitor it slip through the burner assembly and attaches to the burner it is l shaped steel that is fitted in a porcelin housing and when installed correctly it will be directly in front of one of the inshot burners when the main burner lites the flame touches the sensor and holds the gas valve open until the thermostat is satisfied remove it and sand the the l shaped metal end with 100 grit sandpaper until its clean and shinney then reinstall set thermostat to heat and see if it will stay lit if not get furnace brand model and serial# go to local hvac parts house and pick a new flame sensor if its a rheem i generally pay about ten dollars each my cost chances are cleaning will take care of the problem. good luck! hvac ike

Posted on Jan 20, 2009

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I would check furnace filter first. If that looks good i would check the thermostat. To check thermostat turn power off to furnace then take thermostat off the wall and connect wires labbled R & W together then turn power on and check furnace to see if it runs for more than a couple of minutes. If so install a new thermostat. If that doesn't work let me know and i can give you a couple more thing to try.

Posted on Jan 18, 2009

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1 Answer

Janitrol GUPS075-3 Furnace burners will not stay lit


The first thing I would do is make sure the flame sensor is clean, this is a metal rod immersed in the burner flame on the opposite side of the igniter. If too much oxidation builds up on it, it will not allow the burner to stay lit. To clean, just turn off furnace and remove flame sensor and clean with steel wool and then reinstall. If this does not solve the problem there may be a problem with the gas valve.

Nov 08, 2012 | Heating & Cooling

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Furnace cuts off before reaching set temp.


You can make sure it is not the thermostat by crossing or jumping the R and W terminals (or associated wires) together. This will keep the furnace calling for heat. As it is approaching set temperature, get in front of the furnace and inspect the air filter to make sure it is clean, watch the control module for any error codes that may be turning off the system prematurely.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Mar 07, 2010 | Honeywell Programmable Thermostat Heater

2 Answers

Flame sensor dirty


Sandpaper lightly scrubbed over the sensor tip to remove any contamination.

Sometimes cleaning is not enough and the sensor must be replaced.

Jan 30, 2010 | Carrier XHB123D X/Y Series Heat/Cool Air...

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

2 Answers

Lennox furnace 17 yeanrs old. flame comes on and the shuts down sometimes right away some times in a few minutes. We have the furnace go down to 58 at night. It takes all day to get back to 67.


Sounds like a dirty flame sensor.
Also 9 degrees is a large swing to recover. Most specialist will advise no more than a 5 degree set back, otherwise recovery time eliminates any savings you may achieve.

Dec 05, 2009 | Dayton (3E407) Heater

1 Answer

Furnace shut off after 3 time flame from pilot


Sounds like you may have a weak or bad flame sensor. If the circuit board does not sense a good flame it will not light the burners. Also if your furnace is 5 yrs or newer it should give you a fault on circuit board in the form of a blinking or a code itself.

Feb 15, 2009 | Goodman GMS90703BXA Heater

1 Answer

Get heat for awhile then the furnace shuts down.


Great this is good information. I believe it to be one of two issues.
1) The thermocouple (rod that sticks into the flame) is dirty. You can clean this with some steel wool or light sandpaper.
2) If solution #1 does not work then I will say that we have a faulty gas valve (assuming that the gas content and pressure into the house are ok). These are usually pretty generic and can be purchased at your local Grainger (or the like) supply house. Make sure that you are familiar with all of the components involved and read the directions before you remove the old one. If you are not comfortable with this task PLEASE call a licensed technician over. Thanks and good luck!

Jan 27, 2009 | Heating & Cooling

1 Answer

Inside tem. can not reach the set tem. during the cool days


check the presure switch jump it out and see if it fires all the time

Jan 17, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Rheem gas furnace pilot lights, but no burners or fan


If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.

Jan 06, 2009 | Heating & Cooling

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