Question about Honeywell Programmable Thermostat Heater

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Turns on and then off and back on by itself

First the furnace turns on and about 10 seconds later turns off and then about 10 seconds later it turns on again. Why is it doing this?

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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

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Posted on Jan 13, 2009

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SOURCE: Turns on and Turns off

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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Honeywell manuals


Turn the fan in the ON position to verify you have power to the furnace. If the fan turns on, turn it back to AUTO. Pull the thermostat off the wall to get to the low voltage wiring. If you have a gas furnace, pull the red & white wires off and pinch them together. If the furnace starts, the thermostat is bad. If it doesn't start, then begin looking for flame roll out switches in the furnace burner compartment to manually reset. If the furnace inducer (combustion motor starts, & you get no flame, then it is either an ignition problem, or someone didn't pay their gas bill. :0

Dec 11, 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...

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Honeywell CT3400. New batteries but touch pad has become unresponsive


Turn the furnace power off for 10 minutes (the control wiring up to your thermostat is powered from a transformer in the furnace) & turn it back on. Make sure you have 24 volts to the Red wire on the thermostat.

Nov 21, 2013 | 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

The thermostat turns the heating unit off and the fan continues


check your furnace filter to make sure the furnace is not over heating. what brand of furnace do you have and how old is it?Have you changed filter to a different kind last time you changed it?

Jan 16, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Turns on and Turns off


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

Jan 13, 2009 | Honeywell Programmable Thermostat Heater

3 Answers

Dy/night heater turns on for 10 sec then and off, over and over


Hi and welcome to FixYa,

If I understand your concern, it is that the heater switches itself on for 10 seconds and then switches itself automatically off. A couple of ideas of you may want to explore/check:
  1. the built-in protection system detects an internal fault and to prevent any further damage switches itself off;
  2. the faults could be:
  • open heating element (assuming it is electrical);
  • blower not turning;
  • open limit switch. The limit switch is an inline cutoff to the heater that automatically opens up when the heater exceeds a pre-determined temperature independent of the settings in the thermostat. This is like a thermal fuse once gone bad will remain open;
  • whereas a thermostatic switch will turn on if temperature is below its threshold and turn off if the temperature is above. It is basically an on/off switch.
Often the limit switch would look like the image below.
7d0829b.jpg
To be able to provide a more detailed information/assistance, pls verify & post back the model number of the Day Night Heater. Model 8ou-19 does not turn up anything. Or perhaps you can share the website you were referring to.

Good luck and Thank you for using FixYa. Happy Holidays.

Dec 16, 2008 | Honeywell Programmable Thermostat Heater

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