P43 pellet stove fuze blowing issue.

[Jp-nh]

This season started off again with fuzes blowing. Changed circuit panel, combustion blower, auger motor, igniter. Cleaned the auger, sawdust box and probe. Found out the sawdust box hadn't been cleaned in a few years. Still blew the fuze after all of the above was done.
Could neglecting the sawdust box cause the distribution motor to go bad or something? Don't want to keep changing things that aren't bad.
Anyone have these issues or any help would be appreciated. Can't figure this out.

 

[Washed-Up]

Unplug the igniter and light it manually, then individually use an old lamp cord, wire it to the auger, distribution fan and combustion fan to see if they work, if they all do work then it may be the board

 

[Jp-nh]

Unplug the igniter and light it manually, then individually use an old lamp cord, wire it to the auger, distribution fan and combustion fan to see if they work, if they all do work then it may be the board

Hi, We will try this. Thank you.

 

[Jp-nh]

Unplug the igniter and light it manually, then individually use an old lamp cord, wire it to the auger, distribution fan and combustion fan to see if they work, if they all do work then it may be the board

Hi, We tried this and they all work. The fuse blows after 10-15 minutes. We got a new board this fall and it does it on that also after 15 mins. Any ideas?

 

[bogieb]

Do you have a surge protector on there? Are you sure the outlet itself doesn't have an issue? Is there a loose connection at the house breaker panel? Are all wiring connections between the circuit card and fans, augers, igniter good?

@Don2222 , do you have any other insights / suggestions?

 

[Whitenuckler]

This season started off again with fuzes blowing. Changed circuit panel, combustion blower, auger motor, igniter. Cleaned the auger, sawdust box and probe. Found out the sawdust box hadn't been cleaned in a few years. Still blew the fuze after all of the above was done.
Could neglecting the sawdust box cause the distribution motor to go bad or something? Don't want to keep changing things that aren't bad.
Anyone have these issues or any help would be appreciated. Can't figure this out.

I'd add a fuse for each item, even if it's just temporary to find out which circuit it is.

Thread 'Harman P43 Fuse Panel'

Oct 5, 2025

I just finished getting things a bit more presentable. I finally broke down on bought a label machine. First time using automotive type wire tape.
I have been running it for quite a long time and the fuse size is good. I already used the switches when I did my cleaning. I had only the AC and Combustion blower switches on in test mode. I only had to add one extra set of disconnects other than what was already there. I didn't want to dig in the back to find them. I did all the work through the circuit card opening. I have some other pictures and if anyone wants more info let me know.

• Whitenuckler
• Replies: 2
• Forum: The Pellet Mill - Pellet and Multifuel Stoves

• 

 

[jp99]

An obvious thing to check which you maybe have - are the fuses the right rating?

(old story, but I was on aircraft carrier when a 5A fuse blew and knocked out a full half of the ship's electrical busses - was supposed to be 10A)

 

[ARC]

We tried this and they all work. The fuse blows after 10-15 minutes

Does the room blower come on?

 

[Whitenuckler]

This season started off again with fuzes blowing. Changed circuit panel, combustion blower, auger motor, igniter. Cleaned the auger, sawdust box and probe. Found out the sawdust box hadn't been cleaned in a few years. Still blew the fuze after all of the above was done.
Could neglecting the sawdust box cause the distribution motor to go bad or something? Don't want to keep changing things that aren't bad.
Anyone have these issues or any help would be appreciated. Can't figure this out.

Another option is re re-test each item with a fused test cord and with an AC amp meter in series (most meters have AC current mode) and test the currents drawn. I have those currents documented in my other post. Test mode will run most, and do the igniter manually.
Also measure the total current. The new stoves have one 5A fuse on the board. The auger/feed motor should be moving pellets for the test.