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10yr Vulcan Central Heating unit. Had tech come out and said main fan unit was faulty. I replaced myself and still not working. I discovered the O/Temp manual switch had cut off power. When I reset the switch the unit comes on and all works except for my fan which then the unit heats up and cuts off.

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I have the same problem, heating unit will not ignite, it trips out, i go into the roof cavity and remove the top of the unit (4 screws) and there is a motherboard, it has a Green light flashing what tells you the type of fault it has, mine has 3 Flashes telling me it a combustion air pressure system failure, ithen push the reset switch and it starts to initiate, a red light comes on and then it ignites and it will work for about 30 minutes to an hour and a half.

Hope this helps
Shane

Posted on Sep 20, 2008

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