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
- Models: ALL MODELS