When stat calls for heating the furnace inducer fan comes on, runs approx 20 sec then cuts off without gas coming on, then comes back on another ~ 20 sec then cuts off again, comes back on then the gas valve opens .... things work fine thereafter.
> Sometimes it works correctly ....the inducer fan comes on once followed by gas valve opening.
> But, sometimes the inducer fan cycles 2-3-4 times before gas valve comes on.
1. The pc board has been replaced once.
2. Gas valve has been replaced once.
3. Some type sw has been replaced once.
Thank you.
> Sometimes it works correctly ....the inducer fan comes on once followed by gas valve opening.
> But, sometimes the inducer fan cycles 2-3-4 times before gas valve comes on.
1. The pc board has been replaced once.
2. Gas valve has been replaced once.
3. Some type sw has been replaced once.
Thank you.
source https://hvac-talk.com/vbb/showthread.php?2223869-Lennox-furnace-ML-180-UH-135-E-60-D-1-year-old&goto=newpost
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