takagi tk2 problem error code not in manual

Discussion in 'Tankless Water Heater Forum' started by wilfsdad1965, Feb 15, 2009.

  1. wilfsdad1965

    wilfsdad1965 New Member

    Feb 15, 2009
    i have owned this takagi for 4 years. i clean the filters out once a year. i have the remote panel. today during a bad storm, it suddenly fires up for no reason (no water usage) beeps and gives error code 21. this code is not in the manual. i was wondering if i'm getting water coming in from the exhaust valve (it's a side wall exhaust not straight up). it's only happened today during this really big storm when lots of rain is hitting the outside exhaust.:confused:
  2. wilfsdad1965

    wilfsdad1965 New Member

    Feb 15, 2009
    actually, my paper copy doesn't have it, but the pdf from takagi does. error code 21 is vent pipe. i took the front panel off and there is water dripping down onto the base part of the inside. i don't think it's condensation, i think water is coming through the vent pipe and stopping the burner from initiating.
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  4. SewerRatz

    SewerRatz Illinois Licensed Plumber

    Nov 20, 2008
    Chicago Illinois Licensed Plumber
    Chicago, IL
    But as you said the burner was firing up with out any water being used. I would be worried that some electronics might of gotten wet.
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