Make sure the front left log is not sitting directly on the thermopile generator. I had two of those do that in the last 3 weeks. One was a brand new installation. Either cut the back of the log out for clearance or prop it up slightly. Both solutions worked for us. Both solutions were confirmed as fixes through Mendota technical.
CSIA Certified Chimney Sweep
CSIA CDET Dryer Exhaust Technician
NFI Master Hearth Professional
Notice: Advice given is general in nature. Local laws and ordinances may govern and/or supersede the information and recommendations provided. Final determinations are the responsibility of a local qualified industry professional with first-hand knowledge of the situation, and the AHJ.