My York AC/Gas pack unit circuit board red led is flashing 5 times. The inducer motor and blower motor continuously run even when I switch to the AC mode. I am not getting any heat or AC. Please help. I have changed the thermostat but no resolution. Model is: D3GA036N07006A.

Found this to be the flame roll-out switch. Heat exchanger was partially clogged with a rodent which caused flame to impinge on plate where roll out switch senses excessive heat. This locked out the control board. Resolved and furnace is working properly now. Thanks!