Question about Honeywell Programmable Thermostat Heater

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New thermostat honeywell RTH7400 cycles oil furnace every 10 min.

Oil furnace keeps going on and off on every program when thermostat is not calling for heat.had two electric contractors check furnace out and said it was ok,they said problem was with new thermostat. also made sure system setup functions were correct

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  • wmnixdorf May 11, 2010

    what kind of stat, some stats, have a switch on the back saide you have to change from NG/Ele and oil, make sure that is done, if so go through installers set-up and make sure it is set there. IF that is also done than you have wires touching, My thoughts are the stat is not set correct.

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Rth7400 maintains a 1 degree differential in temp so 10 minute cycles are not unusual.

Vinnie

Posted on Dec 24, 2009

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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

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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

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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 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.

Dec 15, 2009 | 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,
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Dec 11, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell programmable Thermostat won't hold time or program


Most thermostats use a six volt transformer for a power source, similar to a door bell, you can tell if yours does by looking at the wires that are attached to the thermostat.

The wires will be thin with just a single strand if you have these wires then you have a transformer, try and find the transformer (good luck) test it with a voltmeter if it fails the test that's it, if not, call the man. Probably it though.

Feb 15, 2009 | Honeywell Programmable Thermostat Heater

3 Answers

Furnace kicks on every 15 mins


fuanace may be oversized and is short cycling it heats up house to fast it is better when they run longer

Dec 06, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell rth7400 keeps turning furnace on


check your heat antisipator setting make sur eit matches your tpye of heat. also, do you have a 2 stage heating sys?

Nov 21, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

Where does the T Wire go on the RTH7400


the t wire is for an outdoor anticipator reset. If you dont have a terminal on your thermostat it does not have to be used. Just tape it off.

Nov 18, 2008 | Honeywell Programmable Thermostat Heater

1 Answer

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This is one where you will need a good control man or woman. The American Standard ASYST system is not intended for the homeowner to change out. It has a room sensor wire that others do not account for.

Jan 15, 2008 | Honeywell Programmable Thermostat Heater

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