My new to me house has an Enviro M55 pellet stove and I've downloaded the manual online. I thoroughly cleaned the stove and found that the convection fan was broken. That was replaced after some frustration and I've installed a programmable thermostat. I fired it up and it has burned well at times but at others not so well. I'm using the high/low setting when starting the stove but I never seem to get the same feed/heat rates. Should I be starting the stove in manual mode then switch it over to the high/low setting? The manual is not a plethora of useful information! Thanks!