My 3 year prehistoric owner furnace HSI ignights simply 2 of the 3 burners requirements to be lit manually?
Answers: own the unit cleaned and serviced
I would doubt that the burners are dirty one only 3 years older so Is your furnace propane? If so you need to own the incoming pressure measured. It sounds like you own a lower gas pressure than furnace requires. Check to see if the burner that doesnt light is utmost away from the valve?If it is than definetly check pressure
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