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Harman XXV manual mode no dist blower

Post in 'The Pellet Mill - Pellet and Multifuel Stoves' started by nhdblfan, Jan 30, 2013.

  1. nhdblfan

    nhdblfan Member

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    Hi all,

    my XXV 2008 vintage had the igniter go today ( panel lite is on, pellets ice cold,original igniter),so I went with manual start up for the first time while I await igniter part. Lit up fine with torch and figured we are all set, well the distribution blower would not kick on (Stove temp on high) like it usually does.Filled it back to auto and on it went.

    Why does it not work in manual mode,I noticed in the manual it says it will not operate in stove temp but even in room temp it will not kick on unless I switch the igniter switch to auto?

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  2. Mr. Spock

    Mr. Spock Minister of Fire

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    Try setting the temperature dial above 3 and the convection fan should come on. 3 or below runs the stove in radiant heat mode.
  3. subsailor

    subsailor Minister of Fire

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    Was the stove in room temp or stove temp? In stove temp manual, the blower won't run at all.
  4. mepellet

    mepellet Minister of Fire

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    On mine, In room temp manual the dist blower will only run when the room temp probe is sensing a temp below the temp setpoint on the dial.
  5. Mr. Spock

    Mr. Spock Minister of Fire

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    On the XXV the blower will run in stove temp manual above setting 3 to prevent overheating.

    :: edit :: Your P61a should run the convection blower in stove temp manual mode with a setting above 5 for the same reason.
  6. nhdblfan

    nhdblfan Member

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    Hi all,
    and thanks for the replies.
    I had that temp dial all the way up to 7 and tried both stove and room mode.Thought at first it might be a dirty ESP probe but the blower kicked on when I switched igniter back to auto.

    any thoughts on where to buy a igniter,most of the mail order ones I see are out west,any dealer is New England that can ship it to me (they all seem to be 99 bucks correct?)?

    thanks
  7. Mr. Spock

    Mr. Spock Minister of Fire

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  8. smwilliamson

    smwilliamson Minister of Fire

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    they call this summer romance mode. You can have fire in the summer without getting heat blowing in yer face.
    Brokenwing likes this.
  9. nhdblfan

    nhdblfan Member

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    Hi Mr Spock,
    and thanks for your help, the stove was built in 08,I did run it for a good while 1/2 hr or more before I switched it,I even tried it later switching back to manual and sure enough it-blower went off.

    I saw that place,thanks its in Montana figured it would take several days to get here.might call them anyway and see if they could 2nd day it. I see guys on ebay in Conn and Allentown selling parts for Harman and emiled them to see if they have it.
  10. nhdblfan

    nhdblfan Member

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    thats funny !
  11. Mr. Spock

    Mr. Spock Minister of Fire

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    I just tested my unit because I was starting to doubt myself. Stove temp high, manual ignition, feed rate 4, temp dial 7. The fan kicked on after about 25 minutes. I did start the stove in auto then immediately to manual to allow ignitor starting. my common sense says the control board wants a certain esp temp satisfied before the fan is signaled. So variables like pellets, intake air temp, cleanliness of stove etc. would come into play.

    We're you able to find an igniter?
  12. mepellet

    mepellet Minister of Fire

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    It took your stove 25 minutes for the convection blower to turn on? If I had to guess, ,y convection blower starts about 4 minutes after flames are visible. I'll try timing it tonight when the thermostat drops low enough to start the stove.
  13. nhdblfan

    nhdblfan Member

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    Yes I did,thanks.
    I drove south a bit over and hour to a Harman dealer and picked one up-installed it this evening.Works like a champ almost worth the C note (bet they cost 15 bucks to make). I did,figured why not, turn it back to manual after running it-and starting it for while on auto,sure enough dist blower turned off ,back to to auto and on it goes.

    Very strange.
    Mr. Spock likes this.
  14. mepellet

    mepellet Minister of Fire

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    My stove took 2.5 minutes for the connection blower to turn on after fire started. I don't think the settings matter but they were feed rate just above 4, room temp fan speed medium and temp dial at about 77. Thermostat was set to 64 at the time.
  15. Mr. Spock

    Mr. Spock Minister of Fire

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    Room temp mode is not in question. The test was done in stove temp manual mode which allows radiant heat operation (no distribution blower) under a certain exhaust temperature.
  16. mepellet

    mepellet Minister of Fire

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    Understood. But my convection blower turns on just as quickly in stove temp manual (when over setting 5 like the manual described, stove temp auto, room temp manual AND room temp auto. Doesn't matter what the position of the room temp/stove temp dial or the auto/manual switch.
    Mr. Spock likes this.
  17. Mr. Spock

    Mr. Spock Minister of Fire

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    Good to hear she the repair is working.

    The only thing I can think of is that the ESP requires a certain temp in stove temp manual (temp dial must at least > 3) before it signals the fan. Perhaps your exhaust never reaches that temp. I would run your experience by your Harman dealer just to be sure your stove is operating correctly.
  18. Mr. Spock

    Mr. Spock Minister of Fire

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    Interesting. I cannot explain the discrepancy with full certainty, but I would postulate a relation to the exhaust temperature at the esp assuming the stove is operating correctly.

    If any Harman Dealers/Techs read the thread maybe the can shed some insight.
  19. mepellet

    mepellet Minister of Fire

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    There is a minimum temp required by the ESP in order for the convection fan to run. Read the sticky at the top of the pellet mill forum.
    Mr. Spock likes this.
  20. nhdblfan

    nhdblfan Member

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    Thats what I thought at first may have been the issue-dirty probe,but the ESP temp reading should not be changing from Distribution blower on,to off when just the igniter toggle is switched from manual to auto correct ?

    I will pull the ESP probe over the weekend and clean it just to see if that makes any difference when I swap from manual to auto.

    I will also add it now light's much faster with the new igniter,perhaps a good warning sign of a soon to fail igniter is slower lighting time
  21. Mr. Spock

    Mr. Spock Minister of Fire

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    Right. The ESP temp reading is not changing when you flip the switch (technically it would go up if the distribution fan is not running but that is off point).
    The main thing is flipping the switch changes the control logic for blower operation. Stove Temp Mode manual want's the ESP to be a certain minimum temperature and the dial temp over 3 before the blower is signaled. If the unit never sees the minimum exhaust temp (what ever that is) at the ESP then the fan will never come on.

    In auto mode, the minimum temperature required to signal the blower is much lower. In effect the blower will run all the time and it's speed(output) in direct relation to the Stove Temp or Room Temp H/L setting.

    Does that make sense?
  22. nhdblfan

    nhdblfan Member

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    "In auto mode, the minimum temperature required to signal the blower is much lower. "

    That might well be the explanation,if the temp signal is less in auto then manual it would make sense that the switch flip-to lower temp signal, was all that was need to kick the blower on.

    Only one thing,even after its running for a couple hours if I kick the switch it still goes off,perhaps that ESP probe is a bit dirty and won't let it get to the hotter "auto" range.

    thanks
  23. subsailor

    subsailor Minister of Fire

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    Are you in stove mode when you do that? Oh wait. I just noticed you have a XXV. I think they're different.
  24. nhdblfan

    nhdblfan Member

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    I am in Stove Mode when doing the switch,I did try the Room Mode and it did not make any difference.
  25. Lousyweather

    Lousyweather Guest

    the temp on for an XXV would be te ESP reading 155 degrees, FWIW. When running in room temp mode, its different. How do you tell what the ESP reading is? Use a DDM

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