Carry the TRIAC by the handle, not by the cord.
If the filter at the back of the handle is plugged, air cannot flow through the tool.
When changing motor brushes, clean the brush holders with a cotton swab and contact cleaner.
Not enough heat, but element is OK, the air intake at the handle is not plugged, and the motor sounds normal.
If the TRIAC nozzle gets wet, do not heat it up fully right away.
At approximately 800 hours of running time the TRIAC 1A brushes should be changed.
The TRIAC BT heat dial illuminates, the tool cools down and does not heat.