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Old 10-23-2010, 05:37 PM   #1
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Heil Furnace troubleshooting


Model #NUGK075DG07 - 867.769426

There is a thread on site here that I came across while doing a little research.

Here is the thread- Heil furnace inducer vibrating, capcitor handling question

I attached a pic from that thread, same exact thing as my sisters.

Just for a quick breakdown from what I have learned, to make sure I am correct.

The inducer is the first item to kick in, in the fire up sequence. It provides induction of air flow to provide the combustion process with oxygen. If it does not operate, nothing else will fire up, including the flame.

Situation-

Blower fan operates. When T Stat is turned on, the induction fan motor hums, I am assuming it is seized up. It did get hot when I investigated the problem. I do not know how long it was left on prior to me doing my investigation.

Questions.

Is there a way to attempt to turn this fan to see if it is a seized motor?

Is there something else I should check after investigating this? Meaning, could this of caused any other damage?

If determining this is the problem, where do I find this part? My location is central Wisconsin.

Thanks for any help.
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Old 10-23-2010, 06:49 PM   #2
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Heil Furnace troubleshooting


Hey, any HVAC guys out there?

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Old 10-23-2010, 09:53 PM   #3
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Heil Furnace troubleshooting


Try checking that capicator
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Old 10-24-2010, 10:40 PM   #4
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Heil Furnace troubleshooting


Alright mods, you can close the thread.
I took the induction fan out and took the fan body apart. Somehow a little chip of wood about an 1 1/2" long by about an 1/8" thick got inside. This was enough to make the fan bind against the body and not allow the fan to start.
Whoda thought.
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Old 10-25-2010, 02:36 AM   #5
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Heil Furnace troubleshooting


Quote:
Originally Posted by Superintendent View Post
Alright mods, you can close the thread.
I took the induction fan out and took the fan body apart. Somehow a little chip of wood about an 1 1/2" long by about an 1/8" thick got inside. This was enough to make the fan bind against the body and not allow the fan to start.
Whoda thought.
I am a Heil and I would question how a piece of wood go into the blower to jam it.

Also breaking the seal on the blower body renders it unreliable after reassembly because the gasket is broken, and there is no kit to fix it.

The odds are extreme a piece of wood was a fault....there just too many barries the would block the wood before it even got near the blower assembly.

Good Luck and go buy a new motor.
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Last edited by hvaclover; 10-25-2010 at 02:46 AM.
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Old 12-30-2014, 02:36 PM   #6
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Heil Furnace troubleshooting


I hate to revive an ancient thread but I have the same model and have some questions.

The motor kicks on and starts blowing cold air for about 45 seconds before the burners ignite. Is that a normal amount of time delay?

Additionally, there are many times throughout the day that the motor kicks on for 5 seconds (can actually count it out every time) then shuts off for about 10. It will do this a couple of times before staying on. Why would it be doing this? Just had it serviced but of course, doesn't happen when service guy is here.

Also, sometimes it will run for a couple minutes, turn off for about 20 seconds, and start back up...

IIRC, it did the same thing last year but didn't seem as bad (maybe I just notice it more). We have only been in the house for 3 years. The thermostat was changed out to a Hunter digital tstat about 2 years ago I believe....
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Old 12-30-2014, 04:11 PM   #7
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Heil Furnace troubleshooting


Diagnostics with intermittent problems is tricky.

If the Inducer motor is kicking on & off for short periods of time with consistency and you want to see if it is a stat circuit problem by bypassing that circuit, turn off power to furnace, remove the stat lines where they connect inside the furnace to terminal screws W & R and then put a jumper line from connection W to R. Turn power back on to furnace.
If problem continues.. then it's not a stat or stat circuit issue.

Do you have a AC meter and the skills to safely check if the ID motor is still receiving 120V when it is temporarily shutting on & off?

If your meter does not have a capacitor checking function, a new capacitor with the same rating as the old one would be a pretty easy & inexpensive part to try.

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Last edited by how; 12-30-2014 at 04:27 PM.
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