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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It depends on the differential that you have programmed into the thermostat. In most of them you can set the temperature you want the thermostat to activate, and then you set the run differential such as three degrees below 65. In other words, the thermostat will activate at 62, and drive the temperature up to 65, cut off and wait for the temperature to drop to 62, where it cuts on again. see:

http://yourhome.honeywell.com/home/Products/Thermostats/

Check http://homeappliance.manualsonline.com/manuals/mfg/honeywell/8000.html to see if you can find the manual if you have lost yours.

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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..

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1 Answer

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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.

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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.

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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.

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