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.

Slant/Fin Concept 21 boiler and purge problem

sloaner Member Posts: 3
I have a Slant/Fin Concept 21 boiler installed in 2003 and regularly maintained. It has shut off with a flashing red LED indicating a problem with purge. There is also water leaking from near a valve atop the hot water tank; I hand-tightened this and the leak appears to have stopped. The user guide does not indicate how to troubleshoot this. Any advice?


  • unclejohn
    unclejohn Member Posts: 1,830
    Could be a bad inducer motor or something blocking the intake and or vent pipe.
  • sloaner
    sloaner Member Posts: 3
    Intake vent is clear.
  • Paul48
    Paul48 Member Posts: 4,469
    Page 24 in the manual.
  • sloaner
    sloaner Member Posts: 3
    The only manual I have is 4 pages long. Do you have a link to a more thorough one?
  • Keith M
    Keith M Member Posts: 78
    Slant/Fin has two IOMs for the Concept 21 boilers. One is for the original control board where there is a clear plastic cover over the main control board. The other uses a control made by United Technologies. The error messages are different for each board. Please let Slant/Fin know which control your boiler has and we will send the correct IOM, we can email a pdf file copy.
    Call 1 800 873 4346 and speak with someone in technical services.
    We can also walk you thru the trouble shooting process.
    Thank you,
    Keith Muhlmeister
    Slant/Fin Corporation