P61A Room Temp Issues

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dannjennyn

dannjennyn

New Member
Oct 30, 2010
9
Ct
I have a 5 year old Harman P61A that won't shut down when it reaches the desired room temp when its operating in the room temp mode. It automatically adjusts the flame from high flame right initial start up when the room is cold and as the room warms the flame adjusts down to an idle flame when the room is at the desired temp but just won't stop feeding pellets so it will shut off all together. I replaced the Exhaust Sensor Probe and Remote Room Temp Sensor, checked all the wire connections to the board and even took a working comp board out of my buddies stove and tried it in mine to rule out the board being the problem. I am out of ideas, anyone have anything else I can try?
 
Sounds normal to me,
It is running in maintenance burn.
If the ignitor switch is in manual it will not stop though, ever,,,,,IIRC.
I've been out of the game for a while now but thought I'd drop by and let my avatar heat up the pellet room. LOL
 
dannjennyn said:
I have a 5 year old Harman P61A that won't shut down when it reaches the desired room temp when its operating in the room temp mode. It automatically adjusts the flame from high flame right initial start up when the room is cold and as the room warms the flame adjusts down to an idle flame when the room is at the desired temp but just won't stop feeding pellets so it will shut off all together. I replaced the Exhaust Sensor Probe and Remote Room Temp Sensor, checked all the wire connections to the board and even took a working comp board out of my buddies stove and tried it in mine to rule out the board being the problem. I am out of ideas, anyone have anything else I can try?
Click to expand...

Going into our 3rd season with the P61 and this sounds normal.
I think that if the room temp stays at setpoint or goes a bit higher and stays there for ??minutes, then
the stove will "shut down". Other than that the flames are lowered by reducing the pellet feed. You end
up with a nice bed of coals to get the fire going quickly when needed. The control strategy seems to work very well.
Does your room temp hold or does is fluctuate?
Our room temp is very stable.
**Note**
Even in "Shutdown" mode pellets are still fed(Slowly) so as to prevent the fire from working its' way towards the hopper.
 
If the room stays a constant temp, its working correctly.
If room continues to heat up and stove keeps running you have an issue.
Did you bump the little switch from auto to manual by mistake maybe?
 
To answer everyones questions,
The "little ignitor switch" is in auto mode (not manual)
In room temp mode set at 70* the room temp will keep getting higher and higher - stove keeps running almost as if it is set in "stove temp mode" but its actually running in room temp mode
I am aware that in “Shutdown” mode pellets are still fed
Additionally, Ive owned this stove for 5 years and previously, the whole time it has worked without any problems at all until this year when it required a extra thorough cleaning because of the dreaded gooey stove syndrom and now this.
 
dannjennyn said:
To answer everyones questions,
The "little ignitor switch" is in auto mode (not manual)
In room temp mode set at 70* the room temp will keep getting higher and higher - stove keeps running almost as if it is set in "stove temp mode" but its actually running in room temp mode
I am aware that in “Shutdown” mode pellets are still fed
Additionally, Ive owned this stove for 5 years and previously, the whole time it has worked without any problems at all until this year when it required a extra thorough cleaning because of the dreaded gooey stove syndrom and now this.
Click to expand...

Verify the remote temp sensor is working by alternately putting the sensor outside then put in front of the stove's hot air exhaust. Of course there will be a delay.
Our stove did go into a similar "run away" condition the first year. I moved the sensor across the room and soldered all connections.
It has not happened again. Bad connections or it was being affected by the cool air behind the stove.
Other than that, it looks like you have covered all the bases.
 
I changed both the ESP and room temp sensors.
 
lessoil said:
dannjennyn said:
To answer everyones questions,
The "little ignitor switch" is in auto mode (not manual)
In room temp mode set at 70* the room temp will keep getting higher and higher - stove keeps running almost as if it is set in "stove temp mode" but its actually running in room temp mode
I am aware that in “Shutdown” mode pellets are still fed
Additionally, Ive owned this stove for 5 years and previously, the whole time it has worked without any problems at all until this year when it required a extra thorough cleaning because of the dreaded gooey stove syndrom and now this.
Click to expand...

Verify the remote temp sensor is working by alternately putting the sensor outside then put in front of the stove's hot air exhaust. Of course there will be a delay.
Our stove did go into a similar "run away" condition the first year. I moved the sensor across the room and soldered all connections.
It has not happened again. Bad connections or it was being affected by the cool air behind the stove.
Other than that, it looks like you have covered all the bases.
Click to expand...

Bump
 
Any luck getting this fixed? Curious as we may have the same issue down the road.
-Thanks!-
 
The room temp sensor seems to be working as the flame size adjusts as the room temp got colder outside the window and got smaller when I brought it back into the house in front of the stove. I am getting the dealer's maintenance tech in here on Monday afternoon to hook up his computer to the information port and see what he finds.
 
This is exactly what my XXV is doing, and its brand new. I wish we were allowed to set low(restart) and high(Shutdown) temps, it would solve this issue. I basically want my XXV to heat on full nuclear to a certain temp, then shutdown until a low temp that I set is hit.
 
I will post again after Monday when the Harman Tech gives me his take on the situation. I hope he can shed some light on this.
 
Hello everyone,
The harman dealer technician came to the house today and hooked up his computer to the diagnostic port on my stove.

ESP temp before firing the stove was 62* and went up to 300+ when stove was operating - Normal

Room temp sensor read 65* before firing the stove and rose to 75* after running for a little while - Normal

Set room temp was 75* originally and he turned it down to 65* to test the stoves shut down capability......

45 mins after the room temp sensor was calling for the stove to shut down the tech saw that the ESP sensor was still reading above 275*

After 2 hours, the ESP never read lower than 270* which means that the ESP wouldn't let the stove shut off completely, leaving it suspended in that maintenance mode, slowly feeding pellets and keeping the exhaust temp above the desired 260* in order for it to shut down.

After rechecking the fresh air inlet and exhaust pipe to make sure they both were clear, he called the Harman factory rep and was told there is another updated board for my stove, This would be the "D" board. Harman now has included a timer in the programming for the comp board that will shut the stove down 40 minutes after the room temp sensor has been satisfied irregardless of ESP temp.

The dealer tech suggested that I first try hooking up outside air to see if that would cool the ESP down faster than the inside air.

So, I am off to the auto parts store tommorrow to get a length of 2-3/8" flex pipe and hang it out a window to try his suggestion before I buy the whole damn kit from Harman. If thats not it I guess I will try that new board. What do I got to lose?
 
It wasn't the outside air, put flex tube on the stove and ran it out the window, it didn't make any difference. So it was off to the dealer today to buy a new updated CPU board for the stove. The Harman tech gave me the part number for the updated board that supposedly has a timer built in to the programming that shuts the stove down after about idling for 40 minutes irregardless of what the ESP temp is. Hope this works. To quote someone else on this forum (I don't remember his name, sorry) "I have made this stove into quite a little hobby"!
 
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