This shut down is a safety feature on the unit so it doesn't over heat. You need to remove a cover that's in the back on the bottom and take compressed air to blow out the dust. Concentrate on the blower especially. Best done out doors. This is also a good opportunity to see if the blower still turns freely. If not it'll need lubed or replaced.
Answers & Comments
This shut down is a safety feature on the unit so it doesn't over heat.
You need to remove a cover that's in the back on the bottom and
take compressed air to blow out the dust. Concentrate on the
blower especially. Best done out doors.
This is also a good opportunity to see if the blower still turns
freely. If not it'll need lubed or replaced.