Jamestown J2000T over heating.....

[Whimpster]

Noticed recently my Jamestown J2000T insert is overheating.....
My control settings are set on 2 or 3 and when I first fire up the stove it feeds pellets as it should and maintains the proper flame....after a few hours it creeps up to almost full throttle with the fuel feed while the fan speed stays at 2 or 3 on the settings...If I turn the control down to the lowest point it doesn't seem to do anything.
The only way to throttle it back down is to turn off the stove and let it cool off....turn it back on and it's good for a few hours and then its back up high again....
Anyone know what to trouble shoot for.....

Thanks.

 

[heat seeker]

Flakey triac in the control? Does the auger motor run continuously when it's overheating?

 

[Whimpster]

Yes the auger motor is running continuously....?
Let it cool off and it works normal for a couple of hours....then the stove goes into a continuous pellet feed?

Thanks

Flakey triac in the control? Does the auger motor run continuously when it's overheating?

 

[heat seeker]

I can't think of anything that would cause the auger motor to run continuously except a triac that shorts when it gets hot. I suppose the stove could revert to its startup program, but that's unlikely.

Perhaps a wiring issue is at fault, but unlikely, especially if you haven't been into the stove lately.

If you can use a soldering iron, replacing a triac is inexpensive and not too difficult. Otherwise, replacing the control board is indicated. I'm hoping others will chime in with ideas...

 

[SmokeyTheBear]

Do you have the rotary knob on your controller?

If so that can over time become flaky as it is a rheostat and they get dirty, the wiper(s) get out of shape, and they can also change resistance values do to heating (both from the environment and loose or dirty wipers or worn materials that the wiper is wiping).

That would be what I'd go about looking at.

 

[Mr. Spock]

Is it possible the high limit snap disk is used to control high temp or is it used just for over-fire protection.

 

[Whimpster]

Thanks for the info.....I'm by-passing the snap disk one at a time to see if it will make a difference....I'll also by-pass the vacuum switch...but I don't think it's that.
I'll try one thing at a time to try to eliminate the problem.
Smokey...I was wondering if it might be the controller knob rheostat..I'll try some switch cleaner on it and see if that helps..

Thanks... back to the drawing board...

 

[Mr. Spock]

Care full with the switch cleaner. If the rheostat is not the wire wound type it may make it worse or destroy it.

 

[SmokeyTheBear]

Is it possible the high limit snap disk is used to control high temp or is it used just for over-fire protection.

It is a manual reset normally closed snap disc that when tripped prevents power from reaching the auger.

 

[Whimpster]

Switch cleaner did the trick.....no runaway stove now...

 

[Whimpster]

Switch cleaner did the trick...no more runaway stove now...

Do you have the rotary knob on your controller?

If so that can over time become flaky as it is a rheostat and they get dirty, the wiper(s) get out of shape, and they can also change resistance values do to heating (both from the environment and loose or dirty wipers or worn materials that the wiper is wiping).

That would be what I'd go about looking at.