oil furnace problems

Discussion in 'HVAC Heating & Cooling' started by jaycafe, Oct 4, 2010.

  1. jaycafe

    jaycafe New Member

    Messages:
    1
    Location:
    Ontario
    I have an issue with my furnace not turning off. It will start fine, at the desired temp, but the blower won't stop (only sometimes it stops). I usually have to go downstairs and turn off the power to the furnace for 10 minutes, then the blower seams to reset itself. I do have an electronic thermostat thats only 2 years old and has fresh batteries.
    Is there a relay or somthing, that is screwing things up?
    Any help would be great!
  2. Thatguy

    Thatguy Homeowner

    Messages:
    1,459
    Location:
    MD
    Please post a schematic.
    For intermittent problems I'd check for loose connections.
    You can also check for Technical Service Bulletins that the manufacturer may have issued regarding this problem.
    Do you have a multimeter?
    Last edited: Oct 4, 2010
  3. Dana

    Dana In the trades

    Messages:
    3,028
    Location:
    01609
    Many hot air furnaces control the air-handler with a snap-disc type thermostat on/near the heat exchanger, which should be turning off the contactor/relay for the blower motor once it has cooled. They sometimes get sticky and need replacement. A weak contactor spring or sticky contacts could also have this symptom if the current for the blower motor provides sufficient make-force once it's on that the spring can't break the contact, in which case turning off the power would sometimes be necessary to get it to release.
Similar Threads: furnace problems
Forum Title Date
HVAC Heating & Cooling Furnace and Generator problems Aug 15, 2012
HVAC Heating & Cooling oil furnace problems Mar 4, 2007
HVAC Heating & Cooling Furnace fan works on AUTO but not on ON Dec 7, 2014
HVAC Heating & Cooling Forced Air Furnace Design, Who Can Do A Good Job? Nov 26, 2014
HVAC Heating & Cooling Run fan only on old gas furnace Nov 25, 2014

Share This Page