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I have a customer with a new gas furnace that will not stay lit, it will go through the proper sequence but the flam goes out after 10 -15 seconds, then it will retry, fire up & go out! The preasure switch is closed and I changed the flame sensor, what else could it be?

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  • Coleman Master
  • 8,220 Answers

Looks like you may need to use a manometer and do a pressure check on the gas valve. Might be air in the lines. Vibration from the blower can cause the tubing between proving switch and inducer can cause a brief interruption of the suction pressure.

Posted on Nov 10, 2010

  • Dan Webster
    Dan Webster Nov 11, 2010

    Now IF your insert is an ODS system (I have no way of knowing exactly where to look for that model number by the way) If the insert uses the popular Oxygen Depletion System safety then your pilot is dusty inside. The oxygen is lowered inside the dusty pilot safety and so it does it's job and shuts down like it's supposed to. What I do is flush out the pilot with a little rust buster. Then wait till that drys. This keeps from messing with the pilot flap and damaging the pilot. This page shows where to clean and includes a video of how it works

    ODS SYSTEM

  • Dan Webster
    Dan Webster Nov 11, 2010

    Sorry I posted this to the wrong solution

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My goodman furnace keeps lighting for about 10 seconds than goes out lots of clicking sounds


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1. Thermostat calls for heat.
2. Draft inducer motor starts.
3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes.
4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas.
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NATE, NCCER, PHCC,HVAC Certified Instructor

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