Auger doesn't shut off on Harman P-61

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ndude

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Oct 14, 2014
4
Wisconsin
I have a harmon P-61, and the auger never seems to shut off. The room blower shuts off when the knob is turned to "off", or the temp gets warm enough, but it continues to feed pellets until the hopper is empty. Any suggestions on a fix for this?

I found this old thread:
https://www.hearth.com/talk/threads/harman-invincible-pellet-stove-wont-shut-off.41284/

Does the P-61 use the same system with a micro-switch on the auger, or is everything in the circuit board on this one?
 
How clean is your ESP? Sounds like it might not be telling the circuit board that the 90 degree cut-out temp has been reached...
 
ndude said:
I have a harmon P-61, and the auger never seems to shut off. The room blower shuts off when the knob is turned to "off", or the temp gets warm enough, but it continues to feed pellets until the hopper is empty. Any suggestions on a fix for this?

I found this old thread:
https://www.hearth.com/talk/threads/harman-invincible-pellet-stove-wont-shut-off.41284/

Does the P-61 use the same system with a micro-switch on the auger, or is everything in the circuit board on this one?
Click to expand...
Those micro switches are long gone....but as Daksy says, check your exhaust path and gently clean the ESP
 
Thanks for the pointer. I removed and cleaned the ESP last night, so hopefully that will fix it. I haven't run it yet.
 
ndude said:
Thanks for the pointer. I removed and cleaned the ESP last night, so hopefully that will fix it. I haven't run it yet.
Click to expand...
How could you not run it immediately to test out the repair ? Its your stove and I can't stand not knowing never mind if it was my own stove !
 
Tried running it yesterday, it seems to have fixed it. It ran for 30+ minutes after turning off, but it stopped before it ran out of pellets.
 
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.Running for 30 minutes after being turned off is normal for a Harman. The ESP has to get down to 90 degrees F before it's shut the unit down completely,. As the probe is cooling it'll still tell the unit to feed pellets. A dirty ESP can insulate it & prevent it from getting an accurate temperature reading...
 
Now that we have been using the stove more, it is acting up again. It seems to shut off OK if I turn the blower knob to off, but it never completely shuts off on the thermostat. I turn the thermostat all the way down, and the house stays 60+, and the hopper is empty in the morning.

Just for clarify, I have the stove connected to an external thermostat (following the tech sheet from harman to wire it in series). I have a switch so I can either use the external thermostat or bypass it to use the normal probe. I get the same result of the stove continuing to feed pellets if I set it to use the external thermostat and turn that all the way down, so the circuit never closes (4-blink status, so room blower is off).

Any other suggestions? I was wondering about testing the exhaust temp probe, but since it seems to shut off with the blower knob, that probably isn't it.
 
ndude said:
Now that we have been using the stove more, it is acting up again. It seems to shut off OK if I turn the blower knob to off, but it never completely shuts off on the thermostat. I turn the thermostat all the way down, and the house stays 60+, and the hopper is empty in the morning.

Just for clarify, I have the stove connected to an external thermostat (following the tech sheet from harman to wire it in series). I have a switch so I can either use the external thermostat or bypass it to use the normal probe. I get the same result of the stove continuing to feed pellets if I set it to use the external thermostat and turn that all the way down, so the circuit never closes (4-blink status, so room blower is off).

Any other suggestions? I was wondering about testing the exhaust temp probe, but since it seems to shut off with the blower knob, that probably isn't it.
Click to expand...
Try turning the stove to OFF unplugging the stove for at least a minute and then plugging it back in. If this reset doesn't work I'd recommend replacing the room temp sensor. That fixed a similar problem for me. When you do, consider cutting the end off the existing sensor and splicing the new one to it. Doubling the wire length will give you more flexibility in sensor placement.
 
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