How to adjust the power level on Vaillant Ecotec – Pre 2012 Models

How to adjust the power level on Vaillant Ecotec

Older ecotecs with 4 circular buttons and 2 temperature dials

  1. Press ‘i’ and ‘+’ button
  2. Press ‘i’ key when D0 is shown ( if not shown scroll to D0 using ”+’ and ‘-‘ )
  3.  Using ‘+’ and ‘-‘ adjust the power level
  4. Press and hold the ‘i’ approx 5 seconds until display no longer flashes (this saves to memory)
  5. Press ‘i’ and ‘+’ button to exit diagnostic mode, alternatively do not press any key for approx 4 minutes


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