Harmon XXV-TC

[MeghonFire]

Hi all, I have had my XXV going on 7 years. Most years I run it as ancillary heat but this winter we have tried to use it to keep the house from using too much oil. So it’s been getting a lot more use. Burning a bag of pellets every 1-2 days. I’ve been doing daily scraping and weekly cleanings (just the easy stuff, not combustion fan). Tonight it was going full blast in room temp mode and we couldn’t get it to turn down. The room temp display kept fluctuating as we watched, which I have never seen before. The stove also got very hot to the touch which is unusual. I ended up unplugging because turning it off didn’t feel like it was going to be fast enough, and I couldn’t tell if it was even trying to shut down. The flames were very large. Ideas on what might be wrong? I feel it’s too young to die on me…

 

[Washed-Up]

Try pulling the esp and giving it a wipe down.

 

[MeghonFire]

Try pulling the esp and giving it a wipe down.

That was it! Thanks a ton!

 

[MeghonFire]

I cleaned the probe and it seemed fixed for a day. Then tonight it happened again.

 

[Washed-Up]

Might have to replace the probe then…that’s what I would try…

 

[MeghonFire]

Do you know if that’s something that we could do ourselves?

 

[Washed-Up]

Absolutely

https://pellet-stove-parts-4less.com/products/harman-black-thermister-exhaust-sensing-probe-esp-3-20-11744-amp

 

[MeghonFire]

Absolutely

https://pellet-stove-parts-4less.com/products/harman-black-thermister-exhaust-sensing-probe-esp-3-20-11744-amp

Thank you!! Is it weird that the room temp display was jumping around? Or would the esp cause that?

 

[Washed-Up]

Possibly yeah, hard to tell.

 

[MeghonFire]

For some reason it’s working again. I guess the ghost in the machine went back to sleep

 

[Washed-Up]

Do you have it plugged into a surge protector?

 

[MeghonFire]

No, straight into the wall. Not a good idea?

 

[Washed-Up]

If it happens again, try another outlet…and yeah triplite is what most here use but any reputable surge protector is recommended as these mother boards aren’t cheap

 

[MeghonFire]

Ok thanks. yeah it wouldn’t shut off again today so to the dealer I go I guess

 

[Washed-Up]

Not getting any trouble codes?

 

[MeghonFire]

All was working well again for a week. Last night while we were sleeping the thing died. No power to the touch screen or anything. I unplugged it and started it up again but it’s weird. Still no error codes. I am going to get a surge protector though just in case

 

[Washed-Up]

Maybe check to see that your wiring harness is securely plugged into the mother board

 

[MeghonFire]

To follow up, the wiring looked okay. I gave it a little jiggle and nothing untoward has happened since then with the stove shutting off. I also put it on a surge protector, thanks for that advice! BUT, the room temp sensor is going haywire again. I'm thinking this would be more related to the room temp probe than the ESP? I have a service request out. I also have never changed the door gasket. How would I know if it's time? Or is it just something that needs to be done occasionally? I'm probably not clever enough to change it myself, so would add that on to my service request. I have the stove cooking in manual mode right now, which is working just fine. The only thing is having it on all night... we like to let the house get pretty cool. Is it okay to run it on a really low burn rate over night? Like 1.0? Otherwise I think we would go through too many pellets. 2400 sq foot, two story house with insulated basement. Stove is on the first floor.

Thanks for all the support and knowledge

 

[Cincinnati Kid]

To follow up, the wiring looked okay. I gave it a little jiggle and nothing untoward has happened since then with the stove shutting off. I also put it on a surge protector, thanks for that advice! BUT, the room temp sensor is going haywire again. I'm thinking this would be more related to the room temp probe than the ESP? I have a service request out. I also have never changed the door gasket. How would I know if it's time? Or is it just something that needs to be done occasionally? I'm probably not clever enough to change it myself, so would add that on to my service request. I have the stove cooking in manual mode right now, which is working just fine. The only thing is having it on all night... we like to let the house get pretty cool. Is it okay to run it on a really low burn rate over night? Like 1.0? Otherwise I think we would go through too many pellets. 2400 sq foot, two story house with insulated basement. Stove is on the first floor.

Thanks for all the support and knowledge

Regarding the door gasket, perform a dollar bill test. Put a dollar bill half way in the door and close it. Try to pull the dollar bill out. Go around the circumference of the door. If you can pull the dollar out, it’s time to replace the gasket.