I have a rheem criterion II

I have a rheem criterion II gas furance the blower motor comes on and won't shut off even if I shut off the thermostat and the heater won't won't even try to ignite at all. The led of the board blinks as follows one green stays on the other green blinks 3 times and shuts off a couple of seconds then blinks 3 times again over and over and the red led doesn't come on att all. Any help would be appreciated.

Check thermostat to make sure the blower switch is set to automatic and not on.

Locate the service label that describes the various fault codes and post a description of the one you are observing. You might find it on the inside of the service panel, or on the control board housing itself.