Pellet ProII only runs on high

I have a pellet pro II which is 18 years old. I'm doing a test run after 3 months of non use. I run it on stove temp mode. When I turn the dial down to low it shuts off. It will stay on if I hold the start button down.

Any ideas?

Thanks
Phil

Bioburner said:

If its just the pot switch it would be a easy and fairly cheap repair. Good luck

Click to expand...

Actually I repaired the board myself about 7 years go. It's actually a two board sandwich. What happened before is the connector that connects the two boards together had a fried wire. It was the 110 hot term. I jumped them with a wire. Worked great. Do you know where I can get the pot? Thank you

Here's the board. How do I know what pot to replace and the specs on the pot?

Now I'm confused. I think you're talking about the blue ones. That's the interior thermostat and mode one. Those work fine. I know that because when I turn the dial on the thermostat one it kicks in where expected. The problem is that when the thermostat reads the stove is hot enough the combustion blower shuts down. The combustion blower should simply go from high to low. Low is just to keep the stove from going out. Then it kicks back into high when the present temp drops enough. That's my problem. I assume that high is full voltage and low is much lower voltage which reduces the combustion blower fan speed. I can clearly hear the difference. This is a very old and simply stove. The feed rate is completely manual. That's what I like about it. I know this stove very well and it's so well made. It is possible for me to run it the way it is but controlling the feed rate. It's on high constantly in the winter anyways. I also use it to heat my hot water. So excess heat is stored in water barrels. There's a barrel next to the stove where heat it stored and another one next to my furnace. The furnace barrel has 100ft of pipe in it which preheats the tap water going into the furnace.

I'm not sure what I'm going to do. The thing is that it works and I can control it with the feed rate which is mechanical. I looked at a wiring diagram and the combustion blower has 2 wires that go directly to the board. That tells me the problem is definitely on the board. The combustion blower gets 110v on high and a lower voltage on low. Something on that board is lowering the voltage and it can't be something small for that kind of voltage. I'm shutting the stove down again and I'll see if I can trace terms 6 and 10 on the board. It would be great if I knew what part actually drops the voltage.

http://www.pellet-stove-parts-4less.com/v/vspfiles/assets/Pellet_Pro_IIparts.pdf

Now I have a new issue. I noticed 2 cracks between holes in the burn pot. Keep in mind this stove is 18 years old. There's also a small hump in the area. Anyone know how to repair this. Maybe a high temp epoxy.

Any suggestions would be appreciated.

I saw the one. I've learned it takes the same flame guide and the gasket kits are the same for most models of Harman stoves. That means it should bolt up. I don't care if it's an exact replacement. Does anyone know if it will fit?

http://www.pellet-stove-parts-4less.com/product_p/1-10-08514.htm