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I have a heil -- model NUGK100DH12-- problem is when power is supplied to it the blower fan comes on right away along with the induction blower and it does have the electronic pilot which all works to thermostat setting. when setting is reached the flame shuts down normally and I think the induction motor cycles correctly, but the blower motor never cycles off. It's on constantly. I tried replacing the fan relay to no avail and am considering replacing the timed fan controller as the next move

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Carrier XHD183D Through-the-Wall Heater/AC runs constantly

YOU COULD EITHER HAVE A THERMOSTAT PROBLEM OR FAN CONTROL PROBLEM.TURN THE POWER OFF AT THE FURNACE AND TAKE THE THERMOSTAT OFF THE WALL.MAKE SURE YOU MARK THE WIRES SO YOU KNOW HOW TO HOOK IT BACK UP AGAIN.RESTORE POWER TO THE FURNACE.TOUCH THE WIRES THAT WERE HOOKED TO THE R & G TERMINALS ON THE T-STAT TOGETHER AND HOLD THEM THERE.OBSERVE THE OPERATION. WHEN YOU TAKE THEM APART DOES THE BLOWER STOP?TRY IT A FEW TIMES. IF IT CONTINUES TO START AND STOP YOU GOT A BAD T-STAT.JEFF

Posted on Dec 15, 2007

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solveditnow
  • 39 Answers

SOURCE: (HVAC) Furnace Not Igniting Quickly

Make sure a back draft in the flue is not happening. Wind can blow it out until the flue heats up. The flame sensor may not be close enough to the burner flame. It may be weak and need to be replaced or if its an optical one it may be dirty and not see the flame very well. Its not wasting much gas but it puts extra wear and tear on the gas controls, is noisy, and, as you said, blows cold drafty air. A gas control system that has issues of any kind is not real safe. It needs to get fixed.

Posted on Jan 08, 2009

pierre1811
  • 144 Answers

SOURCE: Carrier Weathermaker SX (model 58SX100)

There is a small tube that comes off the inducer for cracks or water. If there are cracks then the pressure switch that it is attached to may not be closing all of the time. Also sometimes you can get water in that tubing which will also cause the pressure switch to not close. If thats the case shorten the tube so there is no low droop in it where water can collect. Another thing that I would do is disconnect the tube at the indicer, take a straightened out paper clip or stiff wire and poke it in the nipple on the inducer to make sure it is clear too. Let me know if any of these work. There may be other things we can do.

Posted on Jan 19, 2009

  • 1 Answer

SOURCE: 1990 heil furnace wont light pilot,but air

The gas valve is bad and this is a common problem for these furnnaces. I have the same problem. Let me guess its a DC90?

Posted on Feb 02, 2010

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