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Old 05-01-2016, 04:19 PM   #1
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Question 3 year old furnace stopped working

This is actually the beginning of the 3rd camping season. flushed everything out to get ready for our first trip this year and when I ran the furnace something just didn't seem just right. BUT....... we went anyway and after about the 3rd or 4th light off it wouldn't light off. I would turn the t-stat to off then back on and it would then sometimes light off.
I accessed the furnace area and removed the front cover to see what the flame looked like and had my wife turn the t-stat to on. What I saw was a "lazy flame" not a strong crisp flame that I remember.
I might make mention that I have a Suburban model NT-30SP.
Also, the reason I think that something was wrong was because it didn't seem like the blower was as strong as before.
Could it be the blower or the gas valve or both ?
Thanks in advance
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Old 05-01-2016, 04:26 PM   #2
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Are your battery(s) up to full charge? And in good condition?
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Old 05-01-2016, 05:47 PM   #3
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3 yr. old furnace stopped working

Yes. freshly charged but am plugged into 30 amp ac circuit. Do you think that a bad battery would make this happen even though I'm running on ac ?
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Old 05-01-2016, 06:55 PM   #4
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The lazy flame may be a symptom of restricted gas.
If your other gas appliances are working well, with proper flame height, I would check to see if there is a screen in the inlet of the gas valve that has gotten plugged off a bit.

If so do not try to operate with the screen removed or damaged. It keeps crud from getting into the internals of the gas valve and causing a valve to stick open.

If you are not familiar with this sort of operation have a service tech handle it. AC's that don't function correctly are an inconvenience, furnaces that cannot shut off are deadly.

If you Google Furnace Service Manual, Suburban NT-30 there are some excellent online resources.

Just us good judgement and caution. Saving a service call won't seem like such a good deal if you burn yourself or your equipment.
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Old 05-01-2016, 07:22 PM   #5
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Dirty flame sensor? Try some fine sandpaper on it to take off the crud
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Old 05-02-2016, 06:24 AM   #6
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Mud daubers and some spiders like to nest in furnace, HW heater and fridge burner tubes - they seem to 'enjoy' the odor. It may be a simple disassembly, clean and restore. If not, then you need to dig deeper. What you see may only be a pilot flame based on your description. A new thermocouple then MAY fix the problem - and most replacements can be purchased at any big box store for ten bucks or less.
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Old 05-08-2016, 04:49 AM   #7
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Thanks to all that responded ! Finally was able to get back up there to do some more troubleshooting and had to remove the furnace and bring it home so I could go right through it. I checked all the safety switches and then the gas valve coils. That's where the problem is. One coil has 49 ohms and the other is open (0 ohms). I am ordering a new gas valve today.
Again, thanks for all your responses.
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Old 05-08-2016, 08:46 AM   #8
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Glad to read you have found your problem! Thanks for the update......
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Old 05-08-2016, 11:38 AM   #9
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Quote:
Originally Posted by CampingInADK View Post
Thanks to all that responded ! Finally was able to get back up there to do some more troubleshooting and had to remove the furnace and bring it home so I could go right through it. I checked all the safety switches and then the gas valve coils. That's where the problem is. One coil has 49 ohms and the other is open (0 ohms). I am ordering a new gas valve today.
Again, thanks for all your responses.
You rock! Well done!. I would have taken a sledgehammer to it lol.
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