Takagi T-K2 Error Code 11

Discussion in 'Tankless Water Heater Forum' started by halogen25, May 30, 2009.

  1. bretmoua

    bretmoua New Member

    Feb 12, 2015
    Hi everyone. I'm having the same problem on my TK3 model. I switched out the ignitor and still getting the error code 111. Cleaned out the 3 prongs behind the small peep hole where I can see the burning trying to light. Still no hot water. Can anyone with similar model and problem please post a pic of the high heat fuse. I want to try and replace that next before calling out a tech that'll charge $100 just to look at it.
  2. J M

    J M New Member

    Jan 12, 2016
    San Mateo, California
    I have a TK-2 about 10 years old that was having the same problem. Every evening the heater would not light for about three hours like clockwork and then start working again. Called Takagi and ruled out any fuse issue. They emailed me a procedure for cleaning the burner which I did. However I think the problem was actually a clogged heat exchanger. There was build up of a white to greenish powder in the heat exchanger which I found out the hard way is carbonic acid or some other nasty acid. Part of the procedure for cleaning the exchanger is blowing compressed air through it, however Takagi's instructions actually say to contact them for further instructions if you see this powder. Like an idiot did not. As a result I burnt the crap out of my lungs even though I was wearing a respirator (apparently not fitting as well as it should). TAKE EXTREME CARE IF YOU SEE THIS POWDER AND DO NOT GENERATE OR BREATH ANY DUST. I fixed the problem with the heater but at great cost to myself. Not sure how Takagi recommends handling this scenario, but its worth finding out.
    JJA likes this.
  3. Robin Sta.Ana

    Robin Sta.Ana New Member

    Dec 8, 2017
    How much would it cost to get the heat exchanger cleaned? I have a tk4 and I just got it installed a month ago and it's giving me a problem code 11. Can someone pls help me?
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