Like clockwork our Pellet Stove refuses to work the week of Christmas. We just cleaned out the ash from the box and now the stove fills up the burn pot with pellets but does not light. We get two short blinking light error codes. The ignition pipe is cool to the touch when I empty out the burn pot. I'm thinking we need to clean/replace the ignition switch. Is that correct? Anything else it could be/I'm missing?