353Error - Navien NCB-150E Service Manual

5.2.16 353Error

Error conditions and Check Items
Error
E353
Abnormal water pressure sensor
Check items
Check method
Fault
Abnormal water pressure Defective 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.
1. Check if the cold water pipe input water pressure sensor is wet due to any reason, including
leakage.
2. Replace the water pressure sensor.
3. Check the controller.
Leaking in unit
No
Is the water pressure sensor
normal?
Yes
1. Check connecter
(#1,#2 and #3 of CN 22)
Possible Causes
1. Check the sensor is frozen during the winter.
2. Check the output voltage. (Normal state : 0.3-2.8V)
sensor
3. Replace the PCB if power is not supplied.
Description
Yes
Check leaking in unit
No
Replace the water pressure sensor
Check method
Troubleshooting 119