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Old 05-25-2016, 12:52 PM   #1
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Furnace Issues 2014 8289WS

A few times last season as well as this past weekend my furnace comes on intermittently. The fan starts first as it should then it shuts itself down. Sometimes it runs correctly but most of the time not, any suggestions?
I had it back at my dealer last season but he indicated all is "normal", yeah right😡
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Old 05-25-2016, 12:53 PM   #2
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sounds to me like you are hitting the high limit switch. Do you have any of your floor vents covered on closed off??

I covered some of my vents last year and it shut my furnace down cause it got too hot.

Fan would run for a minute and then just shut off


Hope that helps,
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Old 05-25-2016, 12:56 PM   #3
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Thank you, all vents are open and unobstructed.
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Old 05-25-2016, 01:09 PM   #4
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When calling for heat, the furnace is designed to come on, run the fan a few moments and prove out it is running via a sail switch. This is necessary because they use part of the fan for the combustion chamber. (in a separate part of the furnace)

If the control board/module doesn't see voltage (through the sail switch) it won't try to light the furnace because it deems it unsafe to light.

If the sail switch circuitry is working OK, the furnace will try to light three times.
If it fails to light, the control board/module goes into lock-out and it is necessary to shut the furnace off to retry.

You didn't mention what part of the process your gets to before it shuts down.
Once the fan starts, do you hear a faint clicking like the igniter is trying to light the propane?

You could have electrical or propane delivery issues depending on the result.

Post the brand and model # of the furnace for better answers as well.
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Old 05-25-2016, 01:14 PM   #5
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Ok thank you, I'll get those specs tonight.
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Old 05-25-2016, 06:09 PM   #6
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I had a similar issue with my Roo 19. Can't explain it, but I replaced the crappy analog thermostat with a digital and never had another problem.
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Old 05-25-2016, 07:15 PM   #7
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OK here are the specs for my furnace:
Make, Suburban
Model, NT-30SP

Sometimes the fan runs for 5-10 seconds then shuts down. I do hear it start then after 30 seconds or so a click and heat begins to flow. Most of the time though the fan runs for about 30 seconds and the system shuts down😡😡
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Old 05-26-2016, 11:10 AM   #8
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Good info by 5picker that everyone should make note of. Sounds like an intermittent sail switch. You can bypass it temporarily for a test with a jumper wire as long as your fan is starting up at first, which sounds like it is. 30 seconds or so after your fan starts up until you hear a click to start the burner sounds too long to me.
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Old 05-26-2016, 11:22 AM   #9
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tdidad,
I sounds like you have an intermittent problem which often times is very hard to diagnose.
You are going to have to do some troubleshooting on your own to determine what part of the control system isn't working.
If you are uncomfortable with doing testing yourself, find a good service repair facility or mobile tech.
If you feel capable of following troubleshooting procedures, **HERE** is a link to the Suburban Furnace Service Guide.

Best of luck and let us know what you find.
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Old 05-26-2016, 11:30 AM   #10
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you can have a bad sail switch but more likely it's a carbon-ed up flame sensor or a bad high limit that tripped one to many times . a furnace is nothing to mess with if you don't know what your doing . if you do great if not call someone
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