Exhaust fan running continuously...
The proof of fire switch, manual reset high limit switch, start toggle switch and/or 30 minute timer box may have been damaged or may have been tripped during a power surge...IT'S IT POSSIBLE THAT MORE THAN ONE OF THESE SWITCHES IT BAD...SO CHECK THEM ALL.
UNPLUG THE UNIT
Use a multi-meter or test lamp to check for continuity (flow of electric current). Mine has a beep function.
Check the high limit switch first. It's up over the convection blower and will have a black, blue and purple wires going to it...press the button between the terminals of this switch and listen/ feel for a snap. If you hear or feel it, plug in the unit and see if that was it. Still acting up?
Check the proof of fire switch, it's on the exhaust blower...it's a ceramic switch with two brown wires going to it, check for continuity across the terminals, it should be open (off) when cold. Remove it and heat the underside with a lighter and listen for the snap, then check continuity again. It should be closed (on) now. Blow on it. It should snap open again when the temp falls -20
below 140
or...119
All good? Hmm. then that wasn't it either
Check the start up switch. Disconnect both the red and white wires from the switch and check for continuity across the switch. You should have open until you rock the switch and then you should get closed All set? No?
If you have got down to here and still have not solved the problem....you need to repalce the 30 minute timer box. Note....if the timer box is bad, chances are the auger and igniter should also be operating too. If ONLY the combustion motor is running...double check that high limit switch. It is a normally closed switch so you should be able to bypass it (connect the wires going to it together) to resume normal operation....however...you will want to replace the switch. DO NOT UNDER ANY CIRCUMSTANCES BYPASS SWITCHES TO GET THE STOVE TO RUN AND LEAVE IT THAT WAY. THAT'S HOW YOU BURN DOWN A HOUSE.
HAPPY TROUBLESHOOTING!
Pellet Service Manual Part I
Pellet Service Manual Part II