Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Furnace shutdown

Options
I have a utica 90,000 btu hot water furnace.  When I turn the furnace switch off and back on the furnace will run for a short while, then shut back down.  What could be causing this?
Jdaly215

Comments

  • HVACNUT
    HVACNUT Member Posts: 5,888
    edited March 2023
    Options
    Is there a model number for this Utica furnace?
    In order to continue, do you have an electric meter? A manometer? 
    I take it you don't have a service agreement with a heating company.
  • Wakioni
    Wakioni Member Posts: 1
    Options
    My Trane high efficiency furnace goes through the start up process flawlessly until the blower motor kick-on step in which the furnace shuts off while the blower continue running cold air. I replaced the pressure switch as the tech recommended but it does not help. Thoughts?
  • pecmsg
    pecmsg Member Posts: 4,965
    edited February 24
    Options

    Your tech recommended YOU change the switch?

    HVACNUT
  • HVACNUT
    HVACNUT Member Posts: 5,888
    Options
    The burners fire, then a maybe a 30 second time delay before the blower motor comes on. And when the blower motor comes on, the burners immediately shut off?

    Orthe burners fire, then a few minutes  pass by, the burners shut off, and the blower motor turns on and continues to run?

    If door number 2 is correct, then it seems like a temperature limit is opening. Have the tech tell you to check for 120 volts at the heat speed terminal on the board.
  • mattmia2
    mattmia2 Member Posts: 9,962
    Options
    BWT #1 is an immediate safety hazard because it probably means you have a compromised heat exchanger and the pressure from the blower is blowing out the burner.