tk3 turns on to often

Discussion in 'Tankless Water Heater Forum' started by dh100m, Jan 4, 2011.

  1. dh100m

    dh100m New Member

    Jan 4, 2011
    ontario canada
    My takaki tk3 works fine but even when the toilets flush it turns on for 5 sec or so then shuts off
    I am on a well with average water pressure of 40lb The company did not respond to my inquiry
    any help would be appreciated
  2. zl700

    zl700 DIY Senior Member

    Aug 26, 2009
    Western NY
    The low pressure in the piping system causes the water in the hot side flowing backwards through the heater. After cold water draw stops, the piping system re-pressurizes including the hot water piping, causing brief flow through the heater. When this happens unit fires as designed since it senses flow through the tankless. A good spring loaded check valve on the cold water inlet of the tankless will solve this issue.
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