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Old 12-01-2022, 03:14 PM   #1
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Furnace Problem

We have a problem with our Furnace. It starts and fires up with no problem, But after a few minutes the Burner goes off, But the fan keeps running and does not stop as it would if upto temp.

If turn it off and try again it does the same, Burner for a few minutes then heat off and fan goes on running.

We have gauze over inlet / outlet so there can not be any beasties in the cage. And the safety temp at rear of burner was replaced last service we gave it.


Any help appreciated
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Old 12-01-2022, 03:39 PM   #2
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If you turn your thermostat up 10 degrees, will it keep cycling ?

Mike in Colorado
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Old 12-01-2022, 04:45 PM   #3
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If you turn your thermostat up 10 degrees, will it keep cycling ?

Mike in Colorado

Tried it on various temp settings. Starts, fires up then a few minutes burner stops. Did once relight then went off again.
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Old 12-01-2022, 05:16 PM   #4
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Have you ever ran out of propane with the furnace running? Maybe air pockets?
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Old 12-01-2022, 09:30 PM   #5
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Sail Switch is dropping out...Opening
No DC to controls for flame ignition

Screens on Intake/Exhaust can affect airflow for combustion
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Old 12-01-2022, 09:31 PM   #6
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D. U.
First confirm you have LP. Then light a stove burner the confirm that there is gas in the line. Does the water heater work properly on LP?
Set your thermostat to 70, or as high as it will go and try it again.
Let us know the results.

Mike in Colorado
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Old 12-01-2022, 10:52 PM   #7
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Maybe the high limit snap disc is thinking it's overheated, that would keep the fan running.
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Old 12-02-2022, 04:29 AM   #8
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Have you ever ran out of propane with the furnace running? Maybe air pockets?
Plenty of lpg.
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Old 12-02-2022, 04:30 AM   #9
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Sail Switch is dropping out...Opening
No DC to controls for flame ignition

Screens on Intake/Exhaust can affect airflow for combustion
Screens have been on since we bought her. Going to take unit out and check.
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Old 12-02-2022, 04:31 AM   #10
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Maybe the high limit snap disc is thinking it's overheated, that would keep the fan running.
Not sure what you would call a SnapDisc ?
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Old 12-02-2022, 04:33 AM   #11
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D. U.
First confirm you have LP. Then light a stove burner the confirm that there is gas in the line. Does the water heater work properly on LP?
Set your thermostat to 70, or as high as it will go and try it again.
Let us know the results.

Mike in Colorado
All other appliances seem fine. Will take unit out and see if anything untoward can be seen
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Old 12-02-2022, 07:49 AM   #12
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The "snap disc" is the high limit switch. Never heard it called a "snap disc". It is a limit switch that turns off the burner if the furnace overheats. If the limit switch open the control board turns off gas to the furnace but the fan keeps running for a while.

You haven't said what the brand and model of your furnace is. The furnaces sorta operate the same regardless of brand but if we knew the furnace brand it may help get relevant information.
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Old 12-02-2022, 10:35 AM   #13
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The "snap disc" is the high limit switch. Never heard it called a "snap disc". It is a limit switch that turns off the burner if the furnace overheats. If the limit switch open the control board turns off gas to the furnace but the fan keeps running for a while.

You haven't said what the brand and model of your furnace is. The furnaces sorta operate the same regardless of brand but if we knew the furnace brand it may help get relevant information.
Thank you. It's a Suburban
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Old 12-02-2022, 10:40 AM   #14
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Todays update.

Took front cover off and unit is clean. Fired it up and it ran then seemed to back fire ( but more of splut ) then burner off, after a short while fired up and then ran, burner ofc, burner on But fan constantly on.
So thought was working as should.

Tried it again later and it fired up, then burner off and blowing tepid air, do back to square one.

Thinking of getting another heat/ safety switch which goes on back of furnace again.
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