How to clear error code 78 on a noritz tankless?

To clear error code 78 on a Noritz tankless water heater, follow these steps:

1. Turn off the electrical power to the unit by switching off the circuit breaker or unplugging it from the power outlet.
2. Check the air inlet filter for any dirt, debris or blockages. Clean or replace the filter if necessary.
3. Check that the gas supply valve is fully open and the gas pressure is within the recommended range.
4. Inspect the igniter for any damage or wear. If the igniter is faulty, it may need to be replaced.
5. Once you have addressed any issues, turn the power back on to the unit.
6. Press the power button on the control panel to turn the unit on.
7. Monitor the unit for any further error codes or issues.

If the error code 78 persists, it is recommended to contact a professional plumber or Noritz service technician for further assistance.

Noritz tankless water heater