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Weak flame in intertherm furnace

We have a intertherm propane furnace. the yellow light that flashes indicates a weak flame. We have changed the circuit board, sensors, pressure switch, gas valve, and the yellow light still flashes, indicating weak flame. The furnace will ignite, but as soon as blower kicks on the flame goes out. can you give us any ideas as what would be causing this thanks

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  • horsejad Jan 19, 2009

    it has an electric ignitor it is on a M1M series intertherm furnace

  • Danny Clark
    Danny Clark May 11, 2010

    What kind of ignitor does it have?

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  • 334 Answers

Ok, so we can rule out the ignitor. (standing pilot systems can develop problems that will cause such symptoms.)

Check the gas pressure, make sure you are getting 11 to 14 PSI.

You need that after the regulator all the way to the manifold.

Also check for cracks in the heat exchanger, causing the wind from the blower to distort the flame pattern enough to cause improper contact with the flame sensor.

Make sure the burners and flame channels are clean of rust, and dibri build up, allowing the flame to properly contact the sensors.

Posted on Jan 19, 2009

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