Replaced blower motor and now furnace won’t work at all

Discussion in 'Heating / Cooling Systems' started by Brent Boyer, May 25, 2019.

  1. Brent Boyer

    Brent Boyer New Member

    Messages:
    2
    Likes Received:
    0
    Joined:
    Aug 3, 2018
    So, based on reading previous threads, I decided to resolve my loud furnace issue (Atwood Hydro Flame 7916-II) by replacing the blower motor. I thought everything went smoothly during the install, but now I can’t get the furnace to kick on at all.

    Here’s what’s happening: When I flip the switch to the furnace “on” and turn on the thermostat, I hear the click from the thermostat telling the furnace to start the blower. But the blower never starts. After about 10 seconds, the furnace on/off switch flips itself to off.

    To eliminate the thermostat as the issue, I removed it from the sequence. No difference.

    It’s also worth noting that when I flip the furnace switch on, my overhead dome LED lights dim. That never happened with the old blower motor. It seems like it’s an electrical issue, so I’m thinking of trying a new battery. The fuses all appear to be fine. I’ve double-checked all the wiring connections in the furnace and they appear to be solid as well.

    Help, please!

    Oh, it’s a 1999 Coleman Fleetwood Sea Pine. Furnace with old blower motor always worked fine for us (we’ve owned this pup for two years).
     
  2. nineoaks2004

    nineoaks2004 Every meal is a picnic and every Day is a holiday

    Messages:
    6,636
    Likes Received:
    2,586
    Joined:
    Oct 15, 2006
    Location:
    Graceville, Florida
    Battery might be low, LP could be out, also air in the LP lines can cause a problem, turn the LP valve off then turn it back on slowly then light a stove burner for a few minutes to finish getting the air out of the lines. If this doesn't help check the sail switch to make sure it is working correctly. Good Luck
     
    Brent Boyer likes this.
  3. WrkrBee

    WrkrBee Well-Known Member

    Messages:
    1,731
    Likes Received:
    629
    Joined:
    May 23, 2018
    Location:
    South Carolina
    Did you test the "new" blower motor before installing? NEW= Never Ever Worked. The fan could be in a bind preventing rotation. This, locked rotor, will cause excess power draw and dim your lights.
     
    neighbormike, Sjm9911 and Brent Boyer like this.
  4. Brent Boyer

    Brent Boyer New Member

    Messages:
    2
    Likes Received:
    0
    Joined:
    Aug 3, 2018
    Thanks, WrkrBee. It didn’t occur to me that the new blower motor was the problem, and it absolutely is. I took it out and re-installed the old one, and guess what? Works like a charm again (besides the noisy bearings). Thanks for replying. I’m returning the new one and debating whether to reorder and try again.
     
  5. WrkrBee

    WrkrBee Well-Known Member

    Messages:
    1,731
    Likes Received:
    629
    Joined:
    May 23, 2018
    Location:
    South Carolina
    Some motors can be disassembled and the bearings replaced. Small motors may just have shaft bushings that can be oiled.
     
    Sjm9911 likes this.

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.