Sounds like you my not be getting enough air into the burning pot check the burning grate air holes in the pot see if they are open or blocked shut or cracked or have big burn Thu holes in them if so replace the grates along with the gaskets that are in the pot Also check the air setting make sure the clean out leaver is being opened to clean out the fines in the bottom of pot . Pull the motor and fan off and clean the inside of the blower housing out there are three bolts on the motor plate to remove the motor & plate with fan will come out in one piece. When you relight the fire how long are you waiting before you start the feed of the coal . You have to wait until the small amount of coal in the pot is lit and burning good before you start feeding new coal in the pot if you do not wait until the fire is burning good then you will smother the fire out before it is lit good flip the drive paw over so it can't feed the coal only the blower should be on until the fire takes off good once you have a good fire going then flip the drive paw back over so it can feed fresh coal in . You can add a handful of coal at a time by hand until the fire is burning completely then flip the drive paw over to feed the coal .
Do you know how many teeth your set at for the feed each tooth on the gear drum is 2.5 lbs per hr with Rice coal & what is the air setting # at
The air adjustment will have a thumb screw on top loosen it up and turn the lever to the number on the scale match the Number with the amount of teeth you have set on the gear drum there is a thumb screw there to you have to loosen and move the plate back towards the back of boiler decreases the feed towards the front of boiler increases the feed rate count the teeth with the drive paw start with the plate all the way towards the back of boiler then move towards the front of boiler count each tooth 4 teeth 4 air setting is a good start work from there .