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Triangle Tube Soft Lock Out!

thetyrothetyro Member Posts: 3
Been receiving the B26 error on my Triangle Tube. PSI is reading around 12-15. Same thing happened 6-8 weeks ago but it went away (I believe after I switched over the pressure relief valve, but I'm not sure). It has been happening again today. I've read about bleeding the radiators but I'm unsure what that entails or whether that's even necessary. I've included pictures below and if anyone has ideas on simple things I may be able to check I'd really appreciate it. Oh yeah, the Grundos Alpha circulator is not flashing any info and so may not be operating for whatever reason-- unsure if that matters.. see pics below. Thanks!


  • ZmanZman Member Posts: 5,607
    The boiler thinks it is seeing low pressure.

    There are only a few possibilities:
    You have an inaccurate gage and the pressure is low.
    The pressure fluctuates due to a bad expansion tank or piping issue.
    The pressure sensor on the boiler is bad.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • thetyrothetyro Member Posts: 3
    Thanks. Should I just call my HVAC guy in for this one? Last time it resolved itself so I was hoping it might again or that there may be something I could do...
  • JohnNYJohnNY Member Posts: 2,424
    Can you add pressure yourself? Get the gauge to read 15-18 PSI when the boiler is cold and see if that doesn't put it to bed.
    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.
  • thetyrothetyro Member Posts: 3
    I've tried by switching the pressure relief valve, bring it up to the high teens, but that isn't working.
  • Call your HVAC guy and watch what he does.
    Often wrong, never in doubt.

    Click here to learn more about this contractor.
  • DZoroDZoro Member Posts: 1,032
    Have seen some pressure sensors go bad. Let your tech know everything you have tried.
  • ednelsonednelson Member Posts: 10
    hello I am a Tech support rep from Triangle Tube my name is Ed Nelson
    The B26 means either the pressure is below 10 PSI which is not the case the other option is something in the system has clogged the Low Water Cut Off in the boiler
    the part number for that is PGRKIT20
    if you have any further questions you can call me in the office Monday through Friday 8 AM till 4:30 PM at 856 228 8881 ext. 155
    thank you
    Erin Holohan HaskellZmanSTEVEusaPA
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