Originally Posted By: jsmith10
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Definitely have a HVAC tech. service this system. It sounds like the thermocouple, as if the two from the ignighter is lighting first and then the last two it’s staging.
Of course it depends on the manufacture/type of furnace that it is.
Like Dave said , it do’s sound like there is a pressure problem also but the ONLY way to ensure this system is working properly is to have a QUALIFIED technician service it as I’ve seen a lot of owner repairs and some of them amazed me, that the family was still living.
With-out seeing the system and watching/listening it can be very hard to determine what the actual problem is.
Every system should be checked a minimum of every two years. (my personal opinion)
I'm a licensed journeyman in Idaho and have been doing HVAC for over 25 years (20 in the Air Force) and I have seen what improper maintenance & repairs can/will do.
Vice-President, Idaho Chapter,
Inspected as though my family are to live or work there.