Pellet stove flame dies and shuts off - need advice

[Cottage]

Hello all, looking for some guidance on our Hampton/Regency GCI60 / Enviro M55-FPI (about 10 years old) - before replacing the combustion blower for $500.

Here’s what I’ve done so far and issues:

Stove issues

• Stove is slow to light, triggers a code 3 (exhaust temperature too low), and needs a restart to finally light
• Flame burns ok for a couple hours or less, but slowly dies over time, then code 3 triggers and stove shuts off
• Flame jumps up if door is cracked open, indicating insufficient draft or vacuum not being pulled?

Repairs & maintenance already done​

• Replaced gaskets for door, combustion exhaust blower and chimney
• Stove cleaned out top to bottom
• Cleaned the combustion blower
• Tried all damper and electronic air trim settings

What else should we try?​

My thought is a weak combustion blower issue - but is there anything else I should verify first?

Any advice from people who’ve run into this before would be hugely appreciated.

 

[ARC]

Describe your venting. Also if possible try leaf blower trick. You need a leaf blower that has vacuum abilities. You use leaf blower outside to suck the ash out of venting and hard to reach spots in stove.

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