Rebuilding a Harman Pellet Stove – and Why to use OEM Parts – Update

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When it comes to pellet stoves, it’s best to stick with OEM parts. They’re like the engine of a car—they’re built to work perfectly. In the Harman world, the part specifications are super specific, and anything that doesn’t match can cause the stove to run but not in the way it should.

Rebuilding a Harman pellet stove is pretty simple. You just need to swap out the combustion fan (three screws) and the impeller (one Allen screw). The burn pot is held with four bolts, but you’ll need to take off two brackets (each with two screws) and disconnect the igniter (two wires). The distribution fan is secured by four bolts.

The real challenge isn’t the work itself, which is straightforward and doesn’t require a manual. It’s finding the right parts.

If you’d rather skip the reading, just scroll down to the bottom of this article, and I’ll explain why you should buy OEM parts and what I learned from my experience. Remember, time is money, so make sure you’re getting the best value for your time.

The Problem with Parts

Ordering parts using the OEM number can be a bit of a headache. The distribution blower was easy to replace—I got the right one on the first try—but the combustion blower was another story. It took me two tries to get the right one. The first blower, even though it was advertised as OEM, was a universal model with a single paddle fan, which isn’t right for a Harman stove. The second one was correct, but it came with a special design from China that needed either a new wrench or a different screw. It wasn’t a huge deal, but still a bit of a pain. Buy OEM, not Amazon.

The burn pot was another unexpected twist! Even though I ordered the right OEM part number, the new burn pot had a few larger burn holes, which I thought was a cool upgrade. But guess what? It didn’t come with the gasket I needed. The Harman manual doesn’t mention a gasket behind the burn pot, but without one, the stove couldn’t breathe, and it just wouldn’t work right. Luckily, after digging around online, I found the gaskets on Amazon. Just a heads-up: buy OEM parts, not Amazon.

Don’t Buy Parts from Amazon

Amazon isn’t the best place to get parts for your Harman Advance Stove. Stick with OEM parts because even though my stove ran fine, I noticed some obvious problems that I’ll explain as you read this post. Also it caused massive problems when troubleshooting why the stove would not ignite. Amazon parts specifications were not tight – resistance on sensors were wrong, burn pot material was wrong, and igniter specs were wrong. I had to replace every Amazon part with OE to get a perfect running stove.

Testing and Adjustments

Once I put all the parts together, I fired up the stove. At first, the burn pot only lit up on the left side, and pellets kept spilling into the ash tray. To fix this, I lowered the pellet feed rate by 20% from what the manual suggested. This made the burn pot light up all the way. But here’s the thing: adjusting the burn feed didn’t work. Why? Because I didn’t buy OEM parts.

Update: After three months with this burn pot, the stove just wouldn’t ignite. Replacing the igniters with Amazon ones ($20) didn’t fix it either. So, I had to replace the control board (OEM Harman), the Exhaust Sensor (OEM Harman), the Pressure Sensor (OEM Harman), the Burn Pot (OEM Harman), and the Ignitor (OEM Harman). Keep reading to find out why.

Trying to figure out why the stove wasn’t igniting the pellets was like chasing a ghost! It seemed to be happening for all sorts of reasons, so I had to start fresh to see what was going on. If it did ignite, it took ages—15-18 minutes—which would cause the stove to error out. The new control board had flashing codes, so it kept telling me the pressure sensor was bad. The new Amazon part didn’t ignite at all. The old pressure sensor could ignite slowly and give error codes, which would shut down the feeder.

Following the manufacturer’s instructions, I let the stove run at full open for the four-hour break-in period. Over time, the burn pot settled in, producing a solid flame across its entire surface, but lighting was a bit tricky and eventually failed.

The next morning, I restarted the stove, and it did the same thing: the flame started on the left side before spreading across the burn pot. This made sense because the igniter is positioned toward the left. Within 10 minutes, I had a full, steady flame, but the ignition process was slow. I should have bought the OEM part.

The Benefits of the Rebuild

Rebuilding this stove has given it at least another 10 years of life. The only part I haven’t replaced is the pellet auger motor, which is still running smoothly. After cleaning the ESP sensor, I confirmed that the exhaust temperature is perfect. I replaced the sensor because they’re cheap.

Tools and Labor Required

This isn’t a tough job. Most parts are held together with 8mm, 9mm, and 13mm bolts, along with flat-head metal screws:

•        The distribution fan is held in by four 8mm bolts and has a single electrical plug.

•        To get the combustion fan in place, you’ll need three 9mm nuts. Also, take out the paddle fan, which is held on with a set screw that needs an Allen wrench.

•        The burn pot is secured with four 13mm nuts, and the metal flue plates are held in place by four 8mm screws.

This repair doesn’t require much mechanical know-how, so you don’t need a manual.

Cost Savings

If I’d hired a pellet stove technician, this rebuild would have cost about $2,000. But by doing it myself, I only spent $240, and I got to spend another $450 later because I didn’t buy OEM parts and had to replace all the Amazon parts. I’d call this a learning experience, but it was still cheaper than calling a tech, though I did get a lot of headaches trying to save money on parts. Just do yourself a favor and use OEM parts. Read on.

Final Thoughts

If you have a Harman Advance stove, I highly recommend doing the rebuild yourself. But if you’re not sure about your mechanical skills, hiring a professional is always an option—just be ready for the cost. Don’t replace parts with ones from Amazon. These parts are all substandard and will cause you many headaches. For weeks, I was trying new parts to fix the ignition problem, but the pressure sensor kept testing out bad no matter what I did. It turns out the aftermarket (AMP) burn pot and igniter were the problem all along. When I installed the OEM Burn Pot, gasket, and OEM igniter, the pellet stove started in 3 minutes, just like when it was new. There was no error code showing the pressure sensor was bad. The reason the code was flashing was because the pellet stove was taking too long to light. I replaced the pressure sensor with an exact OEM and blew out the line that attaches to the sensor with 40 PSI of air to clear any debris or clogs.

The stove is running great now, but if I’d known that Amazon parts weren’t as good as they seemed, I probably wouldn’t have bought them. The time and effort I spent fixing it wasn’t worth the savings. Here’s what made the difference:

Burn Pot (Amazon $125) – Harman $325. The main differences were the quality of the material, a slight change in the slope for the pellets, and a slight difference in where the igniter was placed. The Amazon burn pot took 10-15 minutes to light, and it kept error codes. The Harman burn pot, on the other hand, lit up in 3 minutes without any error codes.

Igniter – Amazon $20 – Harman $80. Amazon igniters didn’t heat up as well, glowed differently, and had stiff wires on the right side that made them hard to install. The diameter and fin count were different on the three models I got, too. The Harman igniter had a flexible connection on the right side, which made it easier to install and it got hot right away. I read online that Amazon igniters only last about half a season (3 months), while Harman igniters last 5 years—which is about what I got out of the first one.

Pressure Sensor – The Amazon one was $40 and didn’t look like the original. The pellet stove wouldn’t ignite with this aftermarket part. The Harman pressure sensor was $60, looked just like the original, and ignited in 3 minutes.

The difference between Harman parts and aftermarket parts is really noticeable. It’s not like buying parts for your car where aftermarket parts seem to work okay. From my experience, Harman knows exactly what specifications the parts need to make their pellet stoves work perfectly, and aftermarket knockoffs are a waste of time and money. Who would have thought a metal burn pot (basically a chunk of steel) would stop the stove from igniting? It turns out that the original uses a mix of stainless steel and other metals for fast heating and long life. I have a $125 fishing weight with the Amazon part.

Harman stoves are generally straightforward to fix, but to save yourself some time and headaches, it’s a good idea to get OEM parts. They’re thoroughly tested, work perfectly the first time, and are made right here in the USA. It’s tempting to grab cheaper parts from Amazon, but resist the urge unless you’re ready for future headaches and unnecessary replacements.