Whats the make of stove? Do you get an error code? cowboybob in the UK there is a number of solid fuel pellet boilers all having issues with under rated triacs, actually same with our washing machine!
on the baxter boiler you get code 88 on the panel which is the air flow Triac and code 77 is the hopper thing Triac, the bad news is you can change the Baxter Triacs for uprated ones, no idea but the thing goes into reset and stays put!
I know someone who has paid £30K for a CHAP pellet boiler to run his farm and a couple of holiday homes, its been in nearly 2 years now and only worked for 3 weeks!! But slightly off topic, if you using one on a feed in tariff, you have to replace with an identical one or one that is exactly the same output wise or you get the new lower tariff. The guy down the road has gone back to oil, i offered to fix it for £250 by making a new board for it. Having paid £30k i thought he would see it a bargain, apparently not.......