Question about Hunter Fan Company 5/1/1 Programmable Thermostat

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Furnace will not come on

I set the thermostat to 74 and the furnance will not ignite.

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Run a couple of easy checks:

There are generally two wires on a thermostat for heat these days if you use hot water or steam. If so, touch them together. Does the heat come on? If yes, the thermostat is the problem. If not, you've got a problem with the furnace. If more than two wires, for hot air, you can connect them all together for this test. NOTE where wires came from! R is the common heat wire. G is for the fan and W is for the furnace heat call.

Many thermostats today use a battery to close the relay. You should change it at least once yearly. You may still get a display but no relay action when the battery is weak.

If you do not get a response from your heat source, there are other tests...please repost and state what kind of heat you have...oil or gas, hot air, hot water or steam.

Posted on Jan 04, 2009

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A sampling of various failure codes on a furnace:

Read one LED flash that stays on continuously to mean your furnace has no signal coming from the thermostat and will not operate. Turn the power off and check the thermostat for improper settings or connections.

Interpret one LED flash that blinks on and off to mean your furnace has locked out because it could not ignite after three tries, and must be reset. Interrupt power to your furnace for 20 seconds or lower the thermostat so your furnace does not try to heat, then reset the thermostat to the previous setting. After one hour of lockout, your furnace will automatically reset itself and try to operate as usual.

Decipher two LED flashes to mean the draft blower is not working, or your furnace has a short in the pressure switch circuit. Turn off the furnace power and repair a short or replace the pressure switch.


Read three LED flashes to mean your furnace has an open pressure switch circuit or it has an induced draft blower operating. Check the pressure switch hose of your furnace for blocks or an improper connection. Also, look for blockages in the flue, and tighten any loose wiring.

Translate four LED flashes to mean your furnace has a primary limit circuit open, possibly from loose wiring or blocked filters. Check and clean filters, tighten wiring and check the flue for blockages.

Interpret five LED flashes to mean your furnace senses a flame without a call for heat. This could be from a gas valve closing slowly or a burner flame lingering.



Read seven LED flashes as a warning of a low flame sense microamp signal. This could happen with a coated flame sensor or a lazy flame from poor gas pressure. Turn off the power and adjust the gas pressure according to the information on the rating plate.



See eight LED flashes as meaning an igniter circuit problem due to a bad igniter or an igniter connected improperly. Replace the bad igniter or check the ground wiring, making necessary corrections.



Decipher nine LED flashes to mean the high-stage pressure switch circuit will not close during a high-stage-induced draft blower operation. Your furnace may have a pinched or blocked pressure switch hose, a blocked flue or loose wiring.

Read continuous flashing on the LED to mean your furnace has a reversed polarity of 115 volts. Turn off the power and correct the wiring polarity after reviewing the wiring diagram.

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I would first eliminate one furnace from the equation, the exterior wood furnace... turn its tstat down. Will the gas furnace then operate normally? Can you run the blower manually, as in summer mode? Make sure your filters are clean also... that can sometimes overload the blower.

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1 Answer

I have a RUUD Furnance with a piolet light. There


If you have a pilot, then this is an older furnace. Most of them use a 2 wire thermostat. Allot of the new digital, programmable thermostats require a 3rd wire - a common to the thermostat. Allot of old furnaces do not have a common terminal on the furnace board. It can be done, but takes a good technician. The way around this is to use a digital, programmable thermostat that will operate on straight battery. It will be stated on the thermostat package, saying it will operate with a common wire from the furnace or with only the use of the batteries.
Then make sure that you hook up the 2 wires to the "R" terminal and one wire to the "W" terminal, it doesn't matter which thermostat wire goes to which terminal.
Note: If you have a air conditioner installed, it will be a different story.
Sincerely,
Good Luck,
Paul Gibson

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Is there a pressure switch you can jump to see if it is defective? Is the inducer fan blowing out exhaust? You could also have a dirty pilot.

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Who ever sold you the furnace should have offered you a new thermostat.
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