Furnace Circuit Board Blinking Red Light

[DT6]

In addition to the air filtration problem, I noticed that the red light is blinking on my Dometic furnaces circuit board. Does anyone know what that means?

[splitting_lanes]

When mine did that I interpreted it as low air, but once I messed with the sail switch enough, it started working.

I bent my sail switch so it sticks out into the air flow a little more, actually, a little too much as it hits the fan when it’s spinning down.

[John in Santa Cruz]

indeed, the blinking red light indicated an error on my Atwood, I forget what the error codes were, but mine was 'sail switch'.

ah, random article googled says, solid on is hard problem with circuit board
1 flash every three seconds == airflow or limit switch
2 flashes every 3 seconds == flame sensor
3 flashes every 3 seconds is an ignition lockout failure.

[davidmurphy02]

There is usually a label/sticker on the blower motor down below the circuit board that will give you the explanation for each error code specific to your furnace - probably hasn't changed but you might want to check that.