I've frequently had failed starts and E5 and E6 errors from my Weber Smokefire. The initial feed rate is too high during startup and overwhelms the ignitor. If I scoop out the overflowing flame pot and slow down the feed rate by intercepting the addition of majority of the pellets until there's a good flame started, it starts every time. It's not mechanical or electrical issue, it's a controls issue with a too aggressive feed rate at startup.