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    kingsteve Posts: 1, Reputation: 1
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    #1

    Feb 2, 2013, 12:02 PM
    Heater will not ignite
    Circuit board blinks 3 times indicating faulty pressure switch or clogged vent.

    I changed pressure switch with a running HVAC system, checked the vent & inspected the H S I element

    Vent blower comes on about 20 seconds then system shuts down with self-diagnostics light blinking 3 x’s.

    What else can I check?

    Thanks

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