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joshuajim's avatar
joshuajim
Explorer II
Mar 18, 2018

Suburban furnace issue UPDATE

I have a Suburban SF-30-F furnace with Domestic single zone thermostat in my 2011 Wildwood trailer. I'm making a trip to Arizona next week and when checking systems, it is not working.

Tests so far include verifying propane as cook top which is located directly above the furnace burns three burners full on.

When set to heat, blower kicks on and runs for about 10 seconds when I can hear the solenoid click. This would seem to indicate that the sail switch is operative. I can go outside at the exhaust and smell a faint smell of propane.

Furnace does not ignite and solenoid clicks off and furnace tries multiple times to ignite.

Suggestions on possible remedies?

OK, pulled the unit and it seems that there is no spark from the ignitor. Looks like a new board.

Guess it will be an electric heater in AZ. Fortunately 70's in the daytime, 40's at night.
  • dougrainer wrote:
    You disconnect the spark Electrode wire from the Control Board IgnitorPiezo tower. Turn off the LP or disconnect the 12 volt feed to the Gas Solenoid. Start the Furnace cycle. Use a LONG handle screwdriver with an insulated (wood/Fiberglass) handle and holdthe metal end of the screwdriver about 1/4 inch from the Piezo Tower spade. IF you get a strong spark your board is OK and your problem is either a bad electrode(not likely) or most common,anInsect nest on the burner and stopping the electrode gap for the spark. Doug


    Thanks for your input. I pulled the cover off the burner/electrode area and the area is clean and the electrode is about 1/8" above it. Out here in the desert we don't have mud daubers. No mud. ??
  • My symptoms were the same as what you describe, I had a bad Control Board

    Safe Travels
  • You disconnect the spark Electrode wire from the Control Board IgnitorPiezo tower. Turn off the LP or disconnect the 12 volt feed to the Gas Solenoid. Start the Furnace cycle. Use a LONG handle screwdriver with an insulated (wood/Fiberglass) handle and holdthe metal end of the screwdriver about 1/4 inch from the Piezo Tower spade. IF you get a strong spark your board is OK and your problem is either a bad electrode(not likely) or most common,anInsect nest on the burner and stopping the electrode gap for the spark. Doug

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