Error Code 73

EC73 or Error Code 73

The 73 error code indicates a circuit board setting issue. It is triggered by the following conditions:

  • Jumper connection or dip switch changed while power supplied to heater
  • Improperly programmed circuit board

This error code can be reset by unplugging the heater for 30 seconds and then plugging it back in.

For further technical assistance call 866-766-7489 or visit http://support.noritz.com/servicereplocator.php to find a local service representative

Applicable Models

  • Models: ALL MODELS
Updated on April 12, 2021

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