I was called out on a Harman p52i last week do to not wanting to light. Stove is about 1 yr old and homeowner has had continual trouble and dealer had replaced circuit board, igniter, taped over part of air intake and changed dip switches. Finally HO called us, gave me details on what all has been done. I looked at igniter and both wires were pinched up over igniter and bare. I thought that is probably it so I changed igniter. Same problem. I went thru everything, draft, voltage, wattage, checked for voltage drop in wiring harness, plugged into different outlet, tried a different circuit board. Nothing changed. I was on this 5 hrs and could not come up with anything! It seemed igniter was not heating up enough. It would sit in ignition mode with a pot full of pellets and when opening the door there was no burn smell or charred pellets. I did this probably 10 times. Finally I told homeowner I was going to empty pellets and try somersets just to rule out a fuel issue. I put Somersets in and it fired within minutes like Harmans do! He had American Wood Fiber pellets in the stove from Home Depot. The ones in the red white and blue bags. This is only the 2nd time in 10 yrs that I have been servicing stoves that I have seen pellets that would not light.