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    Takagi KD-20 Error Code 21

    more info - KD-20 quits working To add a little bit to this: The furnace and water heater have independent exhaust lines, but common air intake lines (the WH line tee's off of the furnace line). The water heater will work fine when the furnace is off, but stops with an error code 21 shortly...
  2. C

    Takagi KD-20 Error Code 21

    I have a Takagi KD-20 that works for a bit then stops and flashes an error code 21. We haven't had any problems with it before. Today it is -10degrees F with -30 windchill - the only thing that seems different from most days. The manual just says "vent pipe". any ideas on what is going...
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