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-   -   Heil furnace won't ignite (http://www.diychatroom.com/f17/heil-furnace-wont-ignite-55534/)

mjprel 10-19-2009 05:13 PM

Heil furnace won't ignite
 
Hi - 1st time post here. I've got a small hunting cabin in central WI that I've been having problems with.

The unit is a Heil 5000 series. Model number is a NULE75BG.

In searching the forums here, I'm thinking it's the pressure switch, but looking for confirmation.

The unit receives signal from the thermostat and the exhaust motor (or I think that's what it is) starts. The electronic ignitition starts to glow, but never does ignite. The motor just continues to run.

This problem started last winter just prior to shutting the system down for the year. At that time, I simply replaced the batteries in the thermostat and it started working again. I've tried that this year, but no such luck.

I left a couple of weeks ago and set the thermostat at 45 degrees. The unit was running fine and held temp when we arrived last Friday. Saturday evening is when it started again. Same syptoms as above, exhaust motor was running, but would not ignite. We changed the batteries and shut the unit down for a while. When we started it back up, it immediately started the exhaust motor, but again would not ignite.

Just looking for some confirmation that I may be on the right track. If so, I plan on buying the replacement pressure switch while I'm still in a major city. My only opportunity is to go there on weekends and trying to find a place that would sell parts and be open are slim to none.

I normally keep the water in service until early Dec, after our deer hunting season. But w/o an operational furnace, that is definitely out of the question.

Thanks for any input.

SKIP4661 10-19-2009 06:45 PM

If you are getting the glow bar to glow it is probably not the pressure switch. Could be a spill/limit switch or the gas valve is sticking. If you have a meter check for 24 volts at the gas valve while the glow bar is glowing. Usually towards the end of the glow bar cycle the ignition module will energize the gas valve from 5 to 10 seconds. If you read this voltage the valve is sticking or your out of gas.

mjprel 10-19-2009 09:30 PM

Quote:

Originally Posted by SKIP4661 (Post 342930)
If you are getting the glow bar to glow it is probably not the pressure switch. Could be a spill/limit switch or the gas valve is sticking. If you have a meter check for 24 volts at the gas valve while the glow bar is glowing. Usually towards the end of the glow bar cycle the ignition module will energize the gas valve from 5 to 10 seconds. If you read this voltage the valve is sticking or your out of gas.


Gas I know is good. 250 gallon tank w/ 65% full.

Just checked w/ my BIL who was up this past weekend. Exhaust fan is what's running, and ZERO glow.

Pressure switch still a possibility?

Plumber101 10-19-2009 09:43 PM

Can you see if the control board is flashing a flash code and if so what is the code?

mjprel 10-19-2009 10:48 PM

Quote:

Originally Posted by Plumber101 (Post 343032)
Can you see if the control board is flashing a flash code and if so what is the code?

Will do. Won't be back at the place until this weekend at the earliest.

I'm thinking of buying the replacement pressure switch, as long as it's returnable and trying that this weekend.

I only make it up there every few weekends. But it's getting closer to winter here in WI and can't afford the frozen pipes, so need to figure this out soon.

Plumber101 10-19-2009 10:59 PM

I can't find the Model number you posted. Could you double check it?

mjprel 10-19-2009 11:03 PM

Quote:

Originally Posted by Plumber101 (Post 343057)
I can't find the Model number you posted. Could you double check it?

Thankfully, brother in law brought back the owners manual.

List as a Heil NULE 075BG01

Model 867.778381

Flashheatingand 10-19-2009 11:27 PM

Although pressure switches aren't cost prohibitive, they rarely go bad. Do you know how to use a multi-meter? Why do you suspect the pressure switch as the culprit? The flash code is a good starting point in troubleshooting

newtech 10-20-2009 05:50 AM

Quote:

Originally Posted by mjprel (Post 343060)
Thankfully, brother in law brought back the owners manual.

List as a Heil NULE 075BG01

Model 867.778381

RE check the model number. No NULE listed. There is a NULK and a NULS. www.goheil.com

hvaclover 10-20-2009 07:29 AM

Quote:

Originally Posted by newtech (Post 343106)
RE check the model number. No NULE listed. There is a NULK and a NULS. www.goheil.com


Hi Newtech.:shuriken:


Shouldn't let people sneak up on 'ya like that:laughing:


How 'ya been ?

mjprel 10-20-2009 08:36 AM

Quote:

Originally Posted by newtech (Post 343106)
RE check the model number. No NULE listed. There is a NULK and a NULS. www.goheil.com

Looking at the spec sheet right now.

N - Model Number
U - Upflow
L - LP gas
E - Series
075 - Nominal Input BTU
B - Feature Code (whatever that means)
G - Nominal Air Flow (G=3.5 tons)
01 - No clue, not listed on the sheet

newtech 10-20-2009 04:02 PM

Quote:

Originally Posted by hvaclover (Post 343124)
Hi Newtech.:shuriken:


Shouldn't let people sneak up on 'ya like that:laughing:


How 'ya been ?

Good, and You? Haven't seen ya around in a while..

veesubotee 10-20-2009 04:41 PM

Quote:

Originally Posted by newtech (Post 343280)
Good, and You? Haven't seen ya around in a while..

He's been out getting his teeth sharpened in preparation for Halloween.

hvaclover 10-20-2009 05:23 PM

Quote:

Originally Posted by veesubotee (Post 343291)
He's been out getting his teeth sharpened in preparation for Halloween.

And that root canal w:eek:as a bear too!

yuri 10-20-2009 06:48 PM

Can any one say Smart/Idiot valve? :(I wonder if he has one of those lovely devices.:furious:


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