Question about RTO Takagi Jr. TK-JR-N Tankless Water Heater - Natural Gas

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My Takagi T-K jr. keeps flashing an error code 21....the water turns cold and we shut it off ....wait a few...then turn it back on....works for a little then wil flash again...have replaced the pressure switch...is there a reset we should have done or another problem?

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In my case, the error code 21 was caused by the failure of the vent fan to run-on after shut off (easily verified by listening to the unit). The problem was not resolved by swapping either the fan or the control unit with another heater. I talked to a local service tech who had a couple of suggestions. One was to move DIP switch #6 to the upper position. After doing thisit will be necessary to re-initialize the controll by cycling power off and on. This fixed the problem. I emailed Takagi tech support to ask if I should consider this as permanent fix, or if there was something else I should do. Since I got no reply, I'll pass on the tech's other suggestion: buy a Rinnai.

Posted on Oct 09, 2012

  • Dave Wheeler
    Dave Wheeler Feb 13, 2017

    What is dip switch #6 for?

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SOURCE: Takagi Jr Flash Water Heater

explain your problem.
Takagi is a great tankless heater, very few problems...

need more info

Posted on Aug 09, 2010

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