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Our central heat system failed this fall. The unit would kick on but shut off in seconds, and do that three times, then stop. If I unplugged it, the same three try cycle repeated. I had cleaned the flame sensor. It was beyond my talents to figure out what to try next.
I called a local father son repair shop recommended by a friend. They tried several steps, and even replaced the flame sensor and some relays. In the end they had to replace the entire board. It is a Carrier central heater and AC system. They had talked to Carrier tech support and they first thing the tech support guy said 'wow that is an old unit" as it is 25 year old.
The new board was the cure. I could not see any burned capacitors or any obvious failed parts on the old board. I was just really happy it failed in the fall, and it was a warm enough to survive the weekend until they could come out.
Good luck with your heater. Please let us know what fixed it.
__________________
Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
Last edited by GH85Carrera; 02-04-2020 at 01:19 PM..
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