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  1. #1
    Join Date
    Nov 2007
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    Clare Furnace Intermittent problems

    Hi all, hopefully you can provide some help to me on this...

    I have a Clare NG 70,000 BTU furnace that is about 13 years old.
    model #: HEMI 70 8D
    Code #: 2308M39
    Serial #: H0158535
    hot surface ignition
    new (2 days old) programmable digital thermostat that replaced what a tech said was a defective one.

    the problem started a week ago when after several weeks of the furnace working fine (worked fine last winter too), it was blowing continuously cold air. I checked it out and sure enough ... no flames.

    I was able to take it apart somewhat and sand off the flame sensor and I found that the hot surface igniter was cracked in pieces. I got a hold of a local tech and he replaced the HSI. Still no flames - so he checked out the thermostat and bypassed it - connecting red and white wires and everything seemed to work.

    So i replaced the thermostat. The furnace then worked for approx 1 day - off and on when it should, maintaining the temp in the house as programmed.

    Now this morning, i wake up to cold air blowing out of the ducts and the furnace mainboard is flashing a single flash indicating lockout. Turning off the power to the furnace for 1 min allowed the HSI to light, but again... no flames and the LED is blinking lockout again.

    Flame sensor need replacing? Or high/limit switch? Any help would be appreciated.


  2. #2
    Join Date
    Apr 2005
    N. E. Missouri
    Post Likes
    No DIY....please read site rules at top of page, you should have read them when you registered to post.
    If you had a tech in to repair your furnace, why are you not calling him back and why did you install a thermostat instead of him?
    Do not argue with an idiot. He will drag you down to his level and beat you with experience.

  3. #3
    Join Date
    Nov 2007
    Post Likes
    Thread Starter
    ok, sorry my bad
    please delete

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