Cleaning pellet stove

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dmn5952

New Member
Dec 18, 2025
7
Pennsylvania
Looking for some help I just purchased a used Masterforge H3W80XL to install at my mothers house. I have one of these installed at my house and love it found this one for cheap on FB marketplace. The stove itself inside was CAKED with black sooty material and looks like it has never ever been cleaned. The stove was setting an E5 error come to find out the exhaust was plugged at the heat exchanger where it goes down to the exhuast i did my best to knock as much as i could from it to get good air flow tore the entire stove down as far as i could and cleaned it as much as i could. The area that was clogged is very difficult to get any tools to to clean it and at the exhuast there was a bunch of tarry creosote. I cleaned the exxhust fan area completele and swept the exhaust as far as my brush could reach on the stove and fired it up. It ran good put off good heat. My concern is where teh heat exchanger curves down to the back of the stove I want to get more of that ashy tar out of there until its clean any suggestions? Ive tired compressed air and a brush but the path to get up to it throug the two lower clean outs is very small. Do thos creosote pellets work? does just burning it on a high temp help clear it out? all input apreciated thank you!!
 
Burn on high or as high as you can for a hour then shutdown. After it is cooled off try the leaf blower trick. You need a leaf blower with vacuum capabilities hook vacuum part to vent pipe outside of house and suck all the ash out. You will be surprised how much comes out and if you have neighbors don't point the blower at there house. lol. Short video there are many on U tube just search for pellet stove leaf blower trick

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That is a pretty slick little trick which gives me an idea with compressed air similar to that, if i fab up a plate to put over the exhaust holes that lead into the heat exchanger i could send a lot of air into that and get it to blow some of that stuck stuff out. thank you!
Burn on high or as high as you can for a hour then shutdown. After it is cooled off try the leaf blower trick. You need a leaf blower with vacuum capabilities hook vacuum part to vent pipe outside of house and suck all the ash out. You will be surprised how much comes out and if you have neighbors don't point the blower at there house. lol. Short video there are many on U tube just search for pellet stove leaf blower trick

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If it is not installed, put it outside and burn it as hot as you can.
It will dry the creosote, and then it should flake off and be easy to
remove with the leaf blower trick, as ARC said
The trick is to burn it as hot as you can first
 
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Be careful blowing air into it unless you have it outside…there’s more than one horror story of someone using air while installed inside a house…
 
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Be careful blowing air into it unless you have it outside…there’s more than one horror story of someone using air while installed inside a house…
yeah its not hooked up to anything its a used unit that the guy replaced every part on and couldnt figure it out i turned it on for 30 seconds and bam no air flow lol so its just sitting by my garage door at the moment thanks for the reply though i can imagine the things that people have done turning their house into an ash pot 😂
 
Burn on high or as high as you can for a hour then shutdown. After it is cooled off try the leaf blower trick. You need a leaf blower with vacuum capabilities hook vacuum part to vent pipe outside of house and suck all the ash out. You will be surprised how much comes out and if you have neighbors don't point the blower at there house. lol. Short video there are many on U tube just search for pellet stove leaf blower trick

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If i were to put the leaf blower on the air intake blowing in wouldnt it have the same effect as pulling out of the exhuast as long as the door is closed?
 
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Not as effective but as long as its not in house go for it. The leaf blower trick is usually used on installed stoves so you do not have to take it outside. I do it half way through season (January) and at the end of the season on my stove
 
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Not as effective but as long as its not in house go for it. The leaf blower trick is usually used on installed stoves so you do not have to take it outside. I do it half way through season (January) and at the end of the season on my stove
Ill give it a shot im not sure if my little leaf blower is enough suction to do it but my big backpack will def blow it out from the intake im just trying to knock loose all the cruddy black stuff that i couldnt reach with a brush from the previous owner of it never cleaning it