Test burn: Harman Advance shutdown?

[Romy]

I ran the stove for about an hour this morning. It was a little cool, and since my first test run was in the driveway, I figured another one won't hurt. It fired up, burned clean and hot. When I shut it off everything seemed normal until the combustion blower decided to stay on for 2 or 3 hours (minimum). I kinda lost track doing Saturday chores around the house. I finally pulled the plug. Plugged it back in and the blower stayed off but that can't be normal.

The stove was completely cleaned before I installed it. I refurbished it with a new brick plate and ignitor.

Thanks in advance for your advice.

Romy

 

[Dr_Drum]

I'm sure someone with Harmon experience will chime in soon. My advice would be to try it again to confirm there's a consistent issue. Maybe something was stuck or some kind of glitch?
Mike -

 

[samandlillie]

Completely normal. The stove has to burn all the pellets in and around the burnpot.

 

[Bxpellet]

Normal, If the stove got really hot it will stay on for a long time, I never timed it but it is well over a hour.

 

[summit]

it happens, nothing to be worried about.... especially if you have outside air hooked up.

 

[Delta-T]

An hour I'd say is pretty normal, especially if its not really cold out, but 2-3 hours? That combustion fan is supposed to stay on until the ESP probe in the exhaust reaches 90 degrees, thats how it knows the fire is out. If the room its in, or the air its consuming is warm then it takes a long time to cool off, and then it may well stay on for a long time. If that be your situation then I'd say nothing to worry about. If it was very cool and the fan stayed on, I'd say there might be something up with the ESP.

 

[briansol]

No expereince with that particular brand, but even a 5 min run, after shut down, mine will run a min of 20 min. an hour if it got hot is pretty normal.

 

[slls]

Must be a Harmon thing, my combustion blower is timed to run 10 minutes after shut down.

 

[Romy]

Took the ESP probe out, cleaned it (again) and replaced. Confirmed, after a 3 hour burn yesterday; the combustion blower never shuts off. Several hours later the stove is ice cold and the blower is still running. Is there a way to test the ESP? Should I replace it?

 

[summit]

Took the ESP probe out, cleaned it (again) and replaced. Confirmed, after a 3 hour burn yesterday; the combustion blower never shuts off. Several hours later the stove is ice cold and the blower is still running. Is there a way to test the ESP? Should I replace it?

to do an easy self test of the ESP:
once the stove is shutting down, and there are just a few hot embers in the pot left, open the front door and allow the stove to continue shutting down normally.. the door open lets a huge volume of extra air thru the systems heat exchanger and cools things off much more rapidly... the harman advanve and accentra both have extra panels in front of the heat exchanger which helps trap a lot of residual heat... that esp probe has to register an outgoing temp of 89-90 deg f before it allows the fan to turn off. If the stove shuts down more rapidly when you have the door open, then you'll know the esp if working properly... if not, then get a replacement... if any other ?'s, call your dealer: they have a DDM that can plug into the circuit board and show what temps the esp probe is getting on a digital display.

 

[Lousyweather]

yea, the Advance, Accentra, and Accentra Insert all have covered heat exchangers, and therefore hold heat longer, keeping the air passing the ESP probe hot longer, therefore, the combustion blower runs longer. Alternatively, you could remove the ESP probe and stick the probe in very hot water- the comb blower should start, then, plunge it in ice water- the comb blower should shut off....of course, cold stove here, no fire! Or, you could get with your dealer if the stove is still under warrantee as well.....a DDM will spell out exactly what the ESP probe is reading.....

 

[mark d fellows]

completely normal. Mine runs for like 3 hours after shutdown. It continues to run because a lot of people don't install exhaust with a natural draft. Without natural draft(at least a five foot vertical rise), if the combustion fan shuts off too early while the unburnt pellets are still smoldering, you would get all sorts of smoke in your house. It is very simple how this would work. Without natural draft, or the combustion fan running, it would back up right out of the air intake port.

Just let it run.

Mark

 

[Romy]

I only have about a 2' rise but with OAK, shouldn't combustion blower be blowing cold outside air? I tried to let it run but after 4 hours and the stove was ice cold I pulled the plug again. Something seems wrong but I don't see how it could be draft or lack of draft.

 

[GVA]

have the dealer plug in to the stove as others have said...
It is most likely the ESP but the DDM will prove or disprove this
Better to have them come out rather than throw money at parts trying to see if it is the board or the ESP...