Seton/Greenwood owners; Does your stove pipe ever overheat?

[sparke]

For the second time this season my stove pipe temps have reached high temps. I am guessing 7-800 (High temp silicone burned up and turned to powder). The first time it happened I chalked it up to a dirty pipe touching off. But it just happened again with a fairly clean stove pipe. Air holes inside boiler are clear. Hex is a bit dirty but not so dirty as to cause this issue... Snow storm today but draft inducer is on same setting I always run it. Chimney is fairly clean, not plugged etc... Anyone else experience this issue?

 

[ISeeDeadBTUs]

Sparke . . . I have a magnetic stove thermometer on my 8" stove pipe right before is enters the SS. 300* is a rare high for me. But it's obviously not telling me what the exhaust stream temps are.

 

[sparke]

Aye, I have same type thermometer. It usually reads 250-300* Those were the temps I had yesterday. That is why the overheat is so puzzling. It is totally random. If the Hex was dirty I would expect the exhaust temp to get higher over time. Right now with a full load (1st stage burn) Thermometer is 250*.