1. How old are the pellets and how have they been stored. We are checking to see if moisture has built up within the pellets making them difficult to ignite.
2. We would want to check the Fan and the Auger Motor.

*  Is the fan running continually and in the right direction? To know the fan is running in the right direction, you should feel the air moving over the fire pot.

*  Check the P setting and the running time of the auger. Is the auger running as the chart depicts on page 20 of the owners manual?

If all of that is correct...

3. We would look at the heat sensor once we have ruled out these other alternatives.