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Thread: FIXED: Furnace shuts off after 30 seconds

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    Toined Left At Alba-koi-kee... JohnD's Avatar
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    FIXED: Furnace shuts off after 30 seconds

    Have had this conversation going in another topic, but thought I'd start this in it's own thread.

    Two weeks ago while camping the furnace was running and the LP tank ran out of gas.

    I shut the furnace off as it was warm in the trailer and went outside and flipped the switch on the regulator to the other tank.

    An hour or so later I turned the furnace back on as it was getting a little chilly inside and the fan ran for about 30 seconds . . . then shut off.

    No heat.

    I waited a few minutes and tried it again . . . same thing . . . a couple more times . . . same thing.

    The stove and refrigerator runs fine, as does the water heater, although the water heater doesn't sound like it is burning as strong as it was before!

    Tried the furnace again when we got home . . . same thing . . . and then again this morning . . . same thing.

    I swapped the 2nd. tank to the other side of the compartment (where the first tank was) and tried the furnace . . . 30 seconds and off!

    So . . . I took the empty tank up this afternoon and had it filled and put back where it was originally . . . 30 seconds and off!

    All of the other stuff that runs on propane seems to work (except the water heater still doesn't sound the same as it did before).

    The interesting thing about this is that the only thing I did was to flip the switch on the tank regulator and nothing else . . . and then this problem started.

    Ironically, we've had our Prowler for 15 months and that first tank lasted this long (including a two week winter trip to Tucson last February - nine campouts total)!

    I'm thinking that maybe the switch is broken (or something) on the tank regulator . . .

    Or could it be something else?
    John Daniels, Yuma AZ


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    Senior Member MTPockets's Avatar
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    Re: Furnace shuts off after 30 seconds . . .

    John, it doesn't sound like the regulator if other appliances work. Your furnace should have a two year warranty. If you don't figure it out, call the furnace mfg; maybe they can guide you.
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    Toined Left At Alba-koi-kee... JohnD's Avatar
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    Re: Furnace shuts off after 30 seconds . . .

    Quote Originally Posted by MTPockets View Post
    John, it doesn't sound like the regulator if other appliances work. Your furnace should have a two year warranty. If you don't figure it out, call the furnace mfg; maybe they can guide you.
    Could it be the thermocoupler (or whatever that is called)?
    John Daniels, Yuma AZ


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    Senior Member wdk450's Avatar
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    Re: Furnace shuts off after 30 seconds . . .

    Had another forum report strange heater malfunctions, and it was the sail (airflow detection) switch malfunctioning, shutting down the furnace. This has been reported on this forum, too.
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    Senior Member Bogie's Avatar
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    Re: Furnace shuts off after 30 seconds . . .

    John,

    You don't say which heater you have. I have a Suburban SF 25F. They aren't terribly complicated, but it helps to have documentation. Here is a link to the Suburban service manual. If you have one of these, check out pages 26 (Sequence of Operation) and page 29 (Service hints and diagnosis). This may help you diagnose what's going on.

    You said the heater runs for 30 seconds and stops. Is the fan just running? In the Suburban, the fan needs to start and operate the sail switch in order for the circuit board to start the spark electrode and start the gas flowing. If the sail switch doesn't operate properly, it won't turn on the gas.

    I keep an extra sail switch and a spare circuit board in my repair kit.

    I hope this helps.
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    Senior Member dlw930's Avatar
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    Re: Furnace shuts off after 30 seconds . . .

    John, before you start buying parts, you might check for loose or corroded electrical connections on or to the circuit board. It only takes a small, almost imperceptible, amount of corrosion to keep a 12v circuit from being completed. Since the fan is apparently coming on, the circuit board is being powered, but could be something loose elsewhere.


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    Toined Left At Alba-koi-kee... JohnD's Avatar
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    Re: Furnace shuts off after 30 seconds . . .

    It is a Suburban (not sure of the model #) . . . and it is just the fan that runs for 30 seconds.
    John Daniels, Yuma AZ


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    Founding Wyoming Chapter Leader-retired codycarver's Avatar
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    Re: Furnace shuts off after 30 seconds . . .

    So, The fans cycles. Does the burner fire during the cycle?

    If it doesn't I'm going with a loose connection or the sail switch. I'd pull the outside cover off and try moving the wires while the fan is cycling and see if it fires. Next the switch.
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    Toined Left At Alba-koi-kee... JohnD's Avatar
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    Re: Furnace shuts off after 30 seconds . . .

    Quote Originally Posted by codycarver View Post
    So, The fans cycles. Does the burner fire during the cycle?

    If it doesn't I'm going with a loose connection or the sail switch. I'd pull the outside cover off and try moving the wires while the fan is cycling and see if it fires. Next the switch.
    Didn't hear the burner try to fire . . .

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    Senior Member LBR's Avatar
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    Re: Furnace shuts off after 30 seconds . . .

    Had you checked for blockage of sort in the intake/exhaust that would slow airflow so much that the sail couldn't activate it's switch?

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