Question about Honeywell Programmable Thermostat Heater

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Turns on and Turns off

The furnace turns on but about 10 seconds later it turns off and then waits another 10 seconds and turns on again. Is something hooked up wrong? Why is it doing this?

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  • Annie924 Mar 10, 2009

    I have the same problem- seems to be always in the early morning- it turns on and off repeatedly and won't stop unless i turn the unit off or it goes to a time where it is time to blow hot air again. I had a furnace company come look, they did a complete inspection and found nothing. Should we put in a manual thermostat or just a new digital on?

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Does the furnace burners light? You could have a bad thermostat or a flame sensor. To check if it is thermostat turn power off to furnace take thermostat off wall take wires marked r & w and connect them together then turn power back on. If furnace comes on and stays on then you need a new themostat if not it is the flame sensor inside furnace. Also check furnace filter

Posted on Jan 16, 2009

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When i turn the heat up sometimes it takes a long time for the gas furnace to start ..why?


Watch your furnace when you turn the thermostat up...make sure to record everything that it is doing. If you have an induced draft, forced air system, then the heat sequence of order should go like this... Initial call for heat from tstat, Inducer vent motor turns on-pulls in the pressure switch, circuit board sends power to igniter whether it is spark or hot surface, then gas valve opens. Flame sensor senses flame, burner stays on, and blower motor kicks in to heat the space. If you notice any variance from this, then something needs to be checked by an HVAC Service Tech.

Dec 14, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

My White-Rodgers Model #1F78 5/2 Day Prgm thermostat turns on and ighnites for a few seconds then turns off even after reprogramming or resetting. What should I do next to get the heater to start working?...


If the furnace or boiler burners actually light for just a few seconds and then go out, the problem is probably NOT the thermostat. Most likely the thermostat is calling for heat so the burners light, but there is a safety device called a flame sensor that will shut off the burners if it does not sense the flame properly. It is very common for the flame sensor to get soot, dirt, or oxidation on it and then it can not sense the flame and the furnace does exactly what yours is doing. Most of the time the flame sensor can be cleaned and it will work again. Sometimes a new one will take longer to go bad again. Typically they are a straight or "L" shaped piece of wire about the size of coat hanger wire that just sticks into the flame. The coat hanger type wire usually goes into a white ceramic base which in turn has a wire connected to the back end. Steel wool works good to clean the flame sensor, but if you use coarse wool or coarse sand paper the surface of the flame sensor gets rough and gets dirty faster. It is made of some kind of "polished" stainless steel.

Dec 10, 2013 | WHITE-RODGERS DIV 1F78-151 White 70 Series...

2 Answers

I have a honeywell rth2510 thermastate how can i change from celcious to farenheit


here is a download for the manual on page 12 and 13 in English.
http://customer.honeywell.com/techlit/pdf/PackedLit/69-2380ES.pdf

Press the up and down button simultaneously from a few second till display changes and then on #1 set it to option 1 and that show be C.

Feb 21, 2011 | Honeywell Programmable Thermostat Heater

2 Answers

Why does pilot light turns on gas burner only to have it go out about 10 seconds later? 30 to 40 sec later repeats,without lighting. What is problem? once in awhile, it will light..not often. The burner...


Hello
Sounds like the thermocouple is going bad.The thermocouple is a thin tube that runs from the pilot lite to the gas valve.
What it does is it sences the heat from the pilot lite and keeps the gas valve open to allow the pilot to stay on.
This can be easily repaird by shutting off power and gas to your heater and removeing the thermocouple from the gas valve,then unclip or unscrew it from the pilot lite area.
Any plumbing supply store or home depot or lowes should have these.

Once you get a new one,install to gas valve and pilot lite area then turn on power and gas to heater and follow pilot lighting procedure,you may need to hold gas on for 60 seconds.

Here is a picture of the thermocouple so you know what to look for.


http://thermocatalytic.com/Thermocouple.JPG
http://homerepairgeek.com/wp-content/uploads/2010/12/furnace-thermocouple.jpg

Feb 10, 2011 | 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

Honeywell thermostat TH6110D1021. Blower comes on


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,
Shastalaker7

Dec 11, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Problem with thermostat (honeywell rth111/221). Furnace turns on evern when the switch is in the off position and with the fan switch on auto. switch the fan to on and the heat turns off. Again, all this...


should be installed with
1) red to rc and jumpered to rh
2) green to g
3) yellow or blue to y
4) white to w
to test: remove t-stat connect white and red - furnace should operate normally unitil you disconnect.
if it does replace t-stat

Oct 27, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Turns on and then off and back on by itself


I have rebuilt many RHFE-551FA and RHFE-1001FA control circuit boards. If you would like more information about rates, turn around time, etc, please feel free to email me at fcg233@yahoo.com

Thanks!

Jan 13, 2009 | Honeywell Programmable Thermostat Heater

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