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Problem: Exhaust/Combustion fan won't turn off on St Croix insert

Post in 'The Pellet Mill - Pellet and Multifuel Stoves' started by dhickok11, Nov 5, 2012.

  1. dhickok11

    dhickok11 New Member

    Joined:
    Jan 16, 2012
    Messages:
    5
    Loc:
    Western Mass
    Hello,

    I have a St Croix York insert, I bought it used and I've used it for 2 seasons, I believe it is a 2005.
    The stove runs fine, but for some reason when I power it off, the exhaust/combustion fan will continue to run indefinitely until the unit is unplugged. Also, when I plug it in, the combustion fan turns right on, without the unit being turned on with the power button. It used only power on after turning on the power button and it would turn off on it's own after it cooled. Now, I usually unplug it after the room fan turns off, because I know it is cool at that point, but this is really a hassle, I'd love to just press the power button and not have to worry, also I planned on putting in a thermostat and run it on auto eventually, but the fan is just going to run all day.

    Do you think that a new control board will fix this problem?

    When I first bought the stove it didn't have this problem, the exhaust fan would turn off on its own, without having to unplug the unit. I don't know what happened. Also, in your replies, please try to speak in layman's term, I am somewhat handy and a DIY'er, but I am not that knowledgeable with electronics.

    Thanks in advance for your help,
    Dan

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  2. heat seeker

    heat seeker Minister of Fire

    Joined:
    Feb 25, 2011
    Messages:
    1,986
    Loc:
    Northern CT
    Welcome!

    The likely culprit is the Proof of Fire snap switch. On my Afton Bay, it's mounted right on the combustion blower housing. An easy way to test it is to disconnect it after the stove shuts down and cools off, but the blowers are still running. If the blowers stop when you pull the wire off, the switch is bad. My switch has only 5 volts DC on it, so it's not a shock hazard; I don't know what yours is, so be careful.

    It's possible that the control board is bad, but the snap switch is easy to check, cheap to replace yourself.

    I just reread your post - if the room blower shuts off on its own after the stove cools, the problem is not the POF switch, more likely the board has a shorted triac. Triacs are inexpensive, but you need to be able to solder and desolder on the circuit board.
  3. Hellfire

    Hellfire Member

    Joined:
    Oct 2, 2012
    Messages:
    153
    Loc:
    Sunbury , PA 17801
    Mine just did the same about 2 weeks ago

    80p20038-r-old oem #
    New:
    This what you need:
    http://www.cshincorporated.com/product_info.php/products_id/127
    Good service

    That is what it calls for + i have the same stove as you <same year too

    Better built than the OEM 2 screws hold it in place just bent the tabs on the new one to line up w/old holes good ;) to go
    BTW look at what they want for it>>> http://pellethead.com/products/80P20038-R--Low-Limit-POF-Snap-Switch.html Talk about being HOSED;lol
    Within here: http://pellethead.com/categories/Stove-Parts/St.-Croix-Stove-Parts/
  4. gck978

    gck978 Member

    Joined:
    Mar 9, 2011
    Messages:
    30
    Loc:
    north eastern ma
    you can get those at grainger bought 2 for ten bucks dealer wanted 28 each
  5. Hellfire

    Hellfire Member

    Joined:
    Oct 2, 2012
    Messages:
    153
    Loc:
    Sunbury , PA 17801
    Cool ,good to know but my nearest one (grainger)would cost a lot of $$ in gas

    thanx
  6. heat seeker

    heat seeker Minister of Fire

    Joined:
    Feb 25, 2011
    Messages:
    1,986
    Loc:
    Northern CT
    Grainger ships to you.
  7. Hellfire

    Hellfire Member

    Joined:
    Oct 2, 2012
    Messages:
    153
    Loc:
    Sunbury , PA 17801

    Which one do you speak of
    for a snap disc as i only see $ 9.56 ea not the right application


    Meeting this criteria --- closes on rise (allowing current to flow) not open on rise (high heat set limit)

    OEM is 110 degrees --on rise (engaging disc completes circuit) allows fan to activate

    Does not have to exactly be110 degrees >150 degrees

    i just dont see what one you speak of?

    One other note: I noticed the one that was close to specs was made in China (grainger)the one from CSH inc is made in Canada (which would you choose?)
  8. Hellfire

    Hellfire Member

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    Loc:
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  9. SmokeyTheBear

    SmokeyTheBear Minister of Fire

    Joined:
    Nov 10, 2008
    Messages:
    12,151
    Loc:
    Standish, ME
    If you are going to buy a POF that mounts against the exhaust system, do yourself a favor and by a ceramic one.
  10. dhickok11

    dhickok11 New Member

    Joined:
    Jan 16, 2012
    Messages:
    5
    Loc:
    Western Mass
    Thanks for all the help.
    It appears to be the circuit board. I disconnected the POF switch and the combustion/exhaust fan still ran.
    I bought this one: http://www.ebay.com/itm/80P30523-R-...062?pt=LH_DefaultDomain_0&hash=item2c697fc086

    I have the old style anyway, so at least it's an upgrade.
    Any recommendations for a thermostat? I'd like to install one.
    I found this one: http://www.pondscapesgardencenter.com/Thermostat_200_502_80P30031_R_p/80p30031-r.htm

    Where do I find an inexpensive ceramic POF, Smokey?
  11. Hellfire

    Hellfire Member

    Joined:
    Oct 2, 2012
    Messages:
    153
    Loc:
    Sunbury , PA 17801
    Just curious
    Did you check the molex connector for possible wire pullout (cross talk) a wire possibly touching one another?

    Just want to rule out everything

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