Click here to Find a Contractor in your area.
Welcome! Here are the website rules, as well as some tips for using this forum.

If you've found help here, check back in to let us know how everything worked out.
It's a great way to thank those who helped you.
Need to contact us? Visit https://heatinghelp.com/contact-us/.

90+ Gas Furnace Misfiring (flames sputtering)

csp02csp02 Posts: 3Member
What would cause a 90% gas furnace to misfire? As soon as the burners ignite the flame “sputters” (misfire), blower is not running.

Comments

  • JUGHNEJUGHNE Posts: 5,671Member
    A number of things;
    dirty burners
    gas pressure not right
    inducer fan
    cracked heat exchanger
    probably more

    What does the flame do when the blower comes on?
  • csp02csp02 Posts: 3Member
    The burners don’t stay on long enough, so the blower doesn’t have a chance to come on
  • JUGHNEJUGHNE Posts: 5,671Member
    Does this have a Honeywell Smart Valve on it?
    Picture of gas valve would
  • csp02csp02 Posts: 3Member
    I found the problem. Water in the pressure switch hose, which was caused by a clogged drain line. Thanks for the help
  • DZoroDZoro Posts: 760Member
    Glad you found it, just good ole annual maintenance. Grab the owners manual and you will find more to do. Or even better call a tech and have them go over it, they will check all of that and more, but mostly determine if it truly is operating safely. :)
Sign In or Register to comment.

Welcome

It looks like you're new here. If you want to get involved, click one of these buttons!