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Old 10-12-2013, 12:49 PM   #1
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furnace not working :(

So here it is October and we are getting in our last trip. Needless to say it's a little chilly at night so we turned on our furnace and are having some issues. The fan will run fire a bit blowing cold air then shut off. Any idea on how to get this heat on? We are new and don't have or user manual with us A mistake we won't make again. Thanks for any input!
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Old 10-12-2013, 01:33 PM   #2
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Quote:
Originally Posted by BnD View Post
So here it is October and we are getting in our last trip. Needless to say it's a little chilly at night so we turned on our furnace and are having some issues. The fan will run fire a bit blowing cold air then shut off. Any idea on how to get this heat on? We are new and don't have or user manual with us A mistake we won't make again. Thanks for any input!
1st thing to check is make sure the propane tank is full. #2 is make sure you turn it on very slowly. #3 is light the stove to help purge the air out of the lines. #4 It make take several attempts to get it to light the first time.
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Old 10-12-2013, 01:45 PM   #3
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Here is a troubleshooting guide, manuals, and wiring diagram for a Suburban furnace.
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File Type: pdf Suburban_Furnace_NT-16SE_NT-20SE.pdf (461.1 KB, 166 views)
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Old 10-12-2013, 03:20 PM   #4
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Do you have inline propane gauges on your tanks ? :Your issue sounds like the exact problem we had one cool morning. Up until that morning I had lots of propane, stove worked, and the fridge worked on propane. When I turned the furnace on, it blew cold and then clicked off, no propane. The month before I had bought 2 propane gauges from Costco and put them on each 30 lb tank, figured this would tell me when one is empty. The gauges have an auto shutoff feature that activates if there is a sudden surge, supposedly signifying a break in the line. I guess the furnace draw was too much for these gauges, so it shut the line down. I removed the gauges, and the problem was fixed. Costco has a great return policy.
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Old 10-27-2013, 11:19 AM   #5
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Is the fan set to auto or Hi/Lo?
When you turned it off/on did you wait a min or two between off and on?
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Old 10-27-2013, 12:47 PM   #6
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I have seen several instances where the output of the propane regulator was marginal, and when the temperatures drop (usually at night) the diaphragm in the regulator gets stiff and does not deliver sufficient pressure for high draw items (heater and water heater). The first indication of this problem is when the furnace works when the temperatures are warmer (during the day) and then stops working at night.

A layman test is to light a burner on the stove, and then turn on the furnace and the water heater. As each is turned on, the flame might dip slightly, but should return to its full height.

To actually check the post regulator LP System pressure requires a special low pressure gauge or manometer, and connection of the gauge to the propane line. This is not recommended for anyone not certified to work on LP systems.

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Old 01-07-2014, 04:19 PM   #7
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Hmmmm I had the same problem with my furnace. The outside temp was in the 40's and it wouldn't heat at all, just blew cold air. I lit the stove and it worked fine and when I tried to turn the furnace on the stove burner would dip down to a very small flame, when the furnace would stop trying to light the stove flame would jump back up. I assumed the igniter wasn't working correctly so the furnace was shutting it self off. I might have a gas flow problem with my regulator instead.

I didn't try to use the gas on the water heater, I was using the electric water heating instead. I also gave up on the furnace after 3 or 4 tries. Should I have kept trying it?
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Old 01-08-2014, 09:56 AM   #8
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Depends on how full your tanks are, a 20# cylinder at 25% full will only vaporize 18,450 btu at 40 degrees. your furnace is probaly 15-20,000 btu so if your tanks are low you have flow/pressure issues and the furnace "times" out. Fill your tanks
See the attached chart for more info
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Old 01-08-2014, 10:43 AM   #9
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Full tank of propane so that wasn't the issue.
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Old 01-08-2014, 10:56 AM   #10
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We have had same problem with cooler temps. Now we bring electric heaters :!)
The shut off valve in propane tank can be an issue also.
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