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

How to tell if Steam Trap is Bad?

Dairon421Dairon421 Member Posts: 7
Hey i was just wondering what are some ways to trouble shoot steam traps


  • JohnNYJohnNY Member Posts: 2,424
    Check temperature differential between inlet and outlet. It can be tricky at different points during the heating cycle but there should generally be a 10° difference.
    I use a sonic measuring tool that listens to the trap opening and closing. Or not.
    For installations, troubleshooting, and private consulting services, find John "JohnNY" Cataneo here at :
    "72°F Mechanical, LLC"
    Or email John at [email protected]
    John is the Boilers and Hydronic Heating Systems Course Instructor at NYC's Mechanics Institute, a professional Master Plumber, licensed by The Department of Buildings of The City of New York, and works extensively in NYC while consulting for clients in and out of state.
    John also oversees mechanical installations and maintenance for metro-area clients with his family's company, Gateway Plumbing and Heating along with his brother/business partner.
  • JUGHNEJUGHNE Member Posts: 6,624
    The cheapest ($350) FLIR gun has been my best tool for this.
    Especially if you can follow the return pipe for a foot or 2 away from the trap.
    BTW, this is for rad traps not F&T.

    Has anyone tried the doctor stethoscope on the traps for the sound?
Sign In or Register to comment.


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