We woke early this morning to the CO monitors going off. I immediately smelled acrid smoke (no smoke was visible in the house) and knew the pellet stove must be having an issue. Opened some windows to shut the alarms off. My wife said she shut the stove odwn last night before she came to bed because she said it smelled. I opened the stove door and smoke started pouring into the room so I quickly shut the door. I put the stove in test mode a few times to turn the exhaust fan on and push the smoke outside. I opened the door again and saw that there were alot of unburned pellets in the ash collector bin and some of those were smoldering/smoking. I rremoved the bin and put it in the snow outside. The feed setting is always set at 4, sensor is room temp and I run it in auto ignite. Last time I cleaned the stove/burnpot/exhaust blower cage/baffles/etc... was two weeks ago, right before I went away on business. When I got up yesterday morning (red eye flight night before) the house was cold and the stove was off with blinking panel. I didn't count the blinks. Not the first time this has happened. I have had to change the igniter twice since buying this stove six years ago. Besides the unburned pellets in the ash bin, the burn pot was also overloaded with unburned pellets. I dumped the bin and scraped the burn pot and made a couple attempts to get it to light before she finally started to work. I noticed the flame was lazy when it finally lit. I had several errands to run yesterday and noticed in between running them that the stove had shut down again with blinking code. Reset and got it going again. Other than needing an obvious cleaning I'm wondering if it is time to have it fully serviced by the dealer. May be time for a new door gasket too since the door glass is getting increasingly creosoted up. This past winter I have had a number of problems with the stove. ESP sensor went bad, blower sometimes doesn't come on in high (I think blower control potentiometer on the electronic board may need to be checked/cleaned/replaced), the auger started making grinding noises sometimes and there are frequent pops, pings and bangs coming from the stove. I'm going to give it a good cleaning today, check the exhaust piping is clear and see what happens when I put it back iinto auto - only have 5 bags left to burn for this season. Besides cleaning any other thoughts, ideas?