Fan runs continuously no heat 3 blinks error code So I've learnt it seems a draft problem ..... Blew through little hose and clear disconnected exhaust and still nothing any ideas thanks dave

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    What model of furnace is this? – ThreePhaseEel Oct 18 '16 at 0:11
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    For some reason the draft inducer is not getting the system to the proper pressure, or the pressure switch is malfunctioning. Is this a newly installed system, or a system that's been in service for years? Have you checked to make sure the intake and exhaust are both unclogged and unrestricted? – Tester101 Oct 18 '16 at 10:07

replace pressure switch it is a possibility that it is bad

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    A little more information would be helpful, something like to verify if the switch is bad remove the connections to the switch and use a ohm meter to verify if the switch is changing states when the fan is on / off. would make this a better answer. – Ed Beal Nov 21 '16 at 23:54

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