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.

Melted couplings

HomerJ Member Posts: 1
Suddenly my Beckett AF10 (forced air trailer furnace), has melted 2 couplings within 4 days. What is the cause of the apparent overheated couplings ?


  • billtwocase
    billtwocase Member Posts: 2,385
    Negative pressure. Where is the air intake?
  • lchmb
    lchmb Member Posts: 2,997
    make sure nothing happened to the roof jack...
  • mgdesrochers
    mgdesrochers Member Posts: 20
    I'd echo @billtwocase and @Ichmb, something is preventing the unit from properly venting
    EBEBRATT-Ed Member Posts: 13,799
    It may be venting ok while it is running, maybe not. But you have a backdraft, that's about the only thing that will melt a coupling.

    Probably needs cleaning.

    @Ichmb mentioned the roof jack which is an excellent suggestion. The trailer units are usually marginal on draft.
  • billtwocase
    billtwocase Member Posts: 2,385
    I would recommend a post purge also, check for a cracked heat exchanger, roof jack as mentioned, and blower return are places to start, as well as negative pressures from close dryers, bathroom and kitchen exhaust fans, etc