Any Ideas on why after 7 bags of hard wood burned the error light comes on then shuts down ? Reset it it runs a week then shuts down again . Now the error comes on when the main blower goes on like the power surging then shuts down again, the third round of going over all the trouble shooting in the owners manual the error comes on the both blowers go on and off repeatedly for 2 to 3 minutes then finally it goes off completely while the fire is still burning in the pot.