E353 Abnormal water pressure sensor
If an error (under 0.3V or over 2.8V) in the water pressure sensor is detected continuously for 3 seconds, The system displays the error message E353 on the front panel. If this occurs, the boiler initiates shutdown.
Check items
- Check if the cold water pipe input water pressure sensor is wet due to any reason, including leakage..
- Replace the water pressure sensor
- Check the controller