Jøtul F45 V2 burn times (short) vs. runaway fires

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I think his stove is inside a fireplace with little room for reading a flue probe? But an Auber AT200 installed in the liner may be an option.
I highly recommend it.

If it’s stuffed back in there with no fan that could be one contributing factor to the high temps.
 
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I think his stove is inside a fireplace with little room for reading a flue probe? But an Auber AT200 installed in the liner may be an option.
Just a follow up, yah not much room but I'll look into the AT200.

Been turning down earlier...it's tricky, definitely helps but requires some hands-on because sometimes the fire will go out. Need to add air and it'll kick in again. I still haven't risked a mostly-full firebox but last night we were left with pretty small splits and half a box full got a little hectic but nothing near what I was seeing (~630F high temp, then settled down). Thanks for the tips everyone.
 
Turn down earlier, but do so in steps.
E g dial down 25% or until the flames get quiet (lazy), let it go for 5-10 mins, dial down to lazy again etc.
Turning down too much and/or too soon can make flames disappear.
 
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Have you tried blocking the two unregulated primary boost air holes?
 
Have you tried blocking the two unregulated primary boost air holes?
Still no, @Todd -

  • Where are those unregulated primary boost air holes? Are they the circles below?
  • And did you have a method / size of screw or bolt for blocking them?
  • Do you just access them via the firebox? I can't check because my firebox is currently full of ash (oh, and flames)
[Hearth.com] Jøtul F45 V2 burn times (short) vs. runaway fires
 
Still no, @Todd -

  • Where are those unregulated primary boost air holes? Are they the circles below?
  • And did you have a method / size of screw or bolt for blocking them?
  • Do you just access them via the firebox? I can't check because my firebox is currently full of ash (oh, and flames)
View attachment 332470
Yes those two holes go directly up into the firebox doghouse. I just took two small screws and stuck them into the two doghouse holes. Or you could place a magnet on those bottom holes as well.
 
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Block those holes.
That seems to always be the 1st step in these over fire situations.
 
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Yes those two holes go directly up into the firebox doghouse. I just took two small screws and stuck them into the two doghouse holes. Or you could place a magnet on those bottom holes as well.
Been burning so much STILL haven't blocked them but...from the inside, are they these (see arrows) or are these the main primary outlets?

Or are they inside this area, meaning I have to unbolt (those two hex bolts) of the "inspection cover" to access them? I'm looking at the manual and even the exploded parts view is rather confusing.

Sorry, I'm just idiot-proofing before I go looking for screws...because I can be an idiot!


[Hearth.com] Jøtul F45 V2 burn times (short) vs. runaway fires
 
I think those are the boost holes on the dog house.
It's hard to tell by the pic though.

And i think todd said he put a screw in each.
Sure try dropping a loose bolt or screw in 1 or both.
 
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I think those are the boost holes on the dog house.
It's hard to tell by the pic though.

And i think todd said he put a screw in each.
Sure try dropping a loose bolt or screw in 1 or both.
Yeah @Todd has same stove as me so just confirming, because it would suck to actually block the primary. The exploded view is pretty weird, I can't even find a part that has that triangular area. I'm used to reading parts diagrams and schematics. Maybe I'm just getting blind in my old age!
 
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To anyone reading this thread with my issues or my stove...yep, block the holes. Today was the first time I had the presence of mind to find some small stainless steel screws to block the boost holes while the stove was cold.

The F45 V2 is whole different animal now. Gentle and easy to control...the primary air lever is practically like an accelerator/brake pedal now, and we got to secondary land without burning through our fuel too quickly. This is literally the second time I've dared fill up most of the firebox...I did it once before and STT got to 860 before I gave up and opened the door to cool everything down. This time? We're on hour 2.5 of a burn, cruising at 480-530. No runaway period, no wasted wood. If anything had to open the air a bit to get the temp up. Amazing!
 
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Sounds great! Glad that helped. I wish manufactures would give you more control over these unregulated boost air as well as the secondary air. Probably can’t be done due to EPA regs.
 
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