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York diamond 80 heater does not fire up

Have a york diamond 80 heater/AC unit. When the heater is switched on, the blower comes on at first..but the heater part that usually kicks in after a minute or so, does not come up..AC works fine. Any help is appreciated

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Mostly likely the problem is in the pressure switch that tells the board that the blower started and it is okay to fire the burner. The pressure switch is usually a 2" or so round thing about 1" thick, it will have one or two tubes coming out of it that go to the blower or heat exchanger. Make sure that the tube is not cracked or that it has not come off at either end.
The pressure switch can be jumped out to check out if that is the problem, but you need to jump it out after the cycle has started and the switch needs to open after a cycle for the heater to refire again, so that fix would be very temporary. But it may tell you for sure what the problem is.

Posted on Nov 14, 2009

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