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New Member
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Nov 9, 2009, 03:52 PM
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Short cycle burner
Have a Goodman GMT115-5B Natural Gas. Burners fire and blower comes on. If it has run for a longer period (not too long in my opinion), burner cycles on and off while blower is still running. Burner will ignite burn for 45-60 seconds and shut off then cycle back on again. Cycle will continue to repeat until thermostat reaches temp. Any thoughts?
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Ultra Member
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Nov 9, 2009, 04:02 PM
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Air filter dirty, gas pressure to high, return or supply registars closed. Or a week limit.
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Ultra Member
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Nov 9, 2009, 05:08 PM
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If the circuit board has a diagnostic LED, it will provide clues.
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New Member
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Nov 11, 2009, 03:54 PM
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 Originally Posted by novicehvac
Have a Goodman GMT115-5B Natural Gas. Burners fire and blower comes on. If it has run for a longer period of time (not too long in my opinion), burner cycles on and off while blower is still running. Burner will ignite burn for 45-60 seconds and shut off then cycle back on again. Cycle will continue to repeat untill thermostat reaches temp. Any thoughts?
Now, the burners come on and fire for 12-14 second then shut off, and cycle repeats. I have checked and indicator light is not flashing, no error codes are showing.
Thoughts?
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Ultra Member
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Nov 11, 2009, 03:57 PM
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Could be the limit switch or the flame sencer
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Ultra Member
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Nov 11, 2009, 03:59 PM
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Try bypassing the thermostat to see if cycle is sustained. Connect "R" and "W" circuits together, either at thermostat location or at furnace.
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New Member
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Nov 11, 2009, 10:18 PM
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Originally Posted by Joshdta
could be the limit switch or the flame sencer
Cleaned the flame sensor, changed the filter, by-passed the stat. No change in propblem. Which limit switch and can I check it myself?
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Ultra Member
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Nov 12, 2009, 03:36 PM
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