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Old 01-19-2013, 12:28 PM   #11
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Originally Posted by Charliemomoney View Post
i have no problem with the overhead unit, or the heat strip application ,it cycles with the thermostat fine, just the furnace, i did consider the sail switch, but haven't replaced it yet.. thanks
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Old 01-19-2013, 12:33 PM   #12
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The most frequent cause of the problem that you are describing is the Limit Switch.

The purpose of the Sail Switch is to prevent the burner from igniting if there is not sufficient air flow, or to shut the burner off if the airflow drops below the required CFM. Your burner is igniting.

The Limit Switch is just that. The device that limits the temperature of the chamber to a safe level. If the Limit Switch is not returning to the normal (open on some furnaces, closed on others) state, the furnace will not cycle back on until shut completely off and turned back on.

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Old 01-19-2013, 02:20 PM   #13
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I had a similar issue on my Roo 19. I am not sure if furnace is the same model. Documentation is packed away in trailer for the winter. My problem was with the sail switch. Seems like Suburban was having an issue with some sail switches getting stuck open. The control board must sense an open switch when it was not supposed to be and goes in lockout mode. turning thermostat off and back on resets the furnace. The fix for mine was that the service center was instructed by Suburban to trim sail switch. At least that is what I was told they did. Worked fine after that.
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Old 01-19-2013, 02:35 PM   #14
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Originally Posted by wa3pnt View Post
The most frequent cause of the problem that you are describing is the Limit Switch.

The purpose of the Sail Switch is to prevent the burner from igniting if there is not sufficient air flow, or to shut the burner off if the airflow drops below the required CFM. Your burner is igniting.

The Limit Switch is just that. The device that limits the temperature of the chamber to a safe level. If the Limit Switch is not returning to the normal (open on some furnaces, closed on others) state, the furnace will not cycle back on until shut completely off and turned back on.

RodeoGeorge
This sounds like the best answer to me...
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