Harman P61 Overheat

[dendiggity]

Hey folks! Stove is doing some funky stuff. The other night the stove on 'Stove Temp' setting started feeding way too many pellets for no reason. Stove was burning on low for quite some time, then all the sudden started over-feeding with the thermostat at the lowest setting. Same thing happened a week ago starting up the stove. Pulled the power to 'reset', and it seemed to fix the issue, until the fire died out inexplicably (feed rate 3 / stove temp / thermostat on lowest). I have seen six blinks come from the status light (pellets seems to be combusting just fine), as well as four blinks, but only when I unplug and plug in the stove when warm, and it only happens once with dial on 'stove temp' not 'room temp' - peculiar and contradicts user manual diagnostics. Stove has been recently cleaned including polishing up the ESP.

I'm wondering if the ESP all the sudden has gone bad. Do they last? If I were to attempt a resistance test, where do I touch the multi-meter test leads to? Not much an electrical guy, but sort of.

Or maybe the board is f'ed. Just looking for hints and tips.

I don't trust these stoves that's for sure. This thing is old, but we are good about maintenance, cleaning, and replacing parts and lubricating every year.

Help appreciated!

 

[SciGuy]

ESPs seem to have a finite lifespan although some last well beyond 10 years. Not sure if there's an actually a rhyme or reason to a specific stove's ESP. I unplug them where they plug in at the board. I find them a PITA to get my Fluke probes to make contact with the female outlet I realize I need to make up an adapter to plug the probe into that's easier to attach my meter's probes to.

YMMV,

Hugh

 

[Washed-Up]

I would pull the probe and hit it a good wipe down with alcohol and check the wires to the board and make sure it’s clear of crud under the burnpot

 

[gfreek]

Search the forum, there have been specs listed for resistance, ESP..

 

[Washed-Up]

Another thing I’ve learned this year...if you’re using an APC or surge protector, try another one or direct to a plug outlet as either can be faulty and cause problems

 

[Tonyray]

ESPs seem to have a finite lifespan although some last well beyond 10 years. Not sure if there's an actually a rhyme or reason to a specific stove's ESP. I unplug them where they plug in at the board. I find them a PITA to get my Fluke probes to make contact with the female outlet I realize I need to make up an adapter to plug the probe into that's easier to attach my meter's probes to.

YMMV,

Hugh

So does un pluging the esp cause any stove malfunctions?

 

[Ocelot]

A multi meter on the red wire ESP should be around 1K ohm give or take a small amount. I think the black wire probes are more like 500K ohms

 

[SidecarFlip]

Another thing I’ve learned this year...if you’re using an APC or surge protector, try another one or direct to a plug outlet as either can be faulty and cause problems

Why I like the Tripp Lite Isobar. It has LED fault lights on it so it 'tells' you if it has failed.