353Error - Navien NCB-180 Service Manual

5.2.15 353Error

Error conditions and Check Items
Error
E353
If an error (under 0.3V or over 2.8V) in the water pressure sensor is detected continuously for 3 seconds, The
Abnormal water
system displays the error message E353 on the front panel. If this occurs, the boiler initiates shutdown.
pressure sensor
1. Check if the cold water pipe input water pressure sensor is wet due to any reason, including leakage..
Check items 2. Replace the water pressure sensor
3. Check the controller
Check method
Fault Possible Causes
Anormal water Defective water
pressure sensor pressure sensor
Leaking in unit
NO
Is the water
pressure sensor
normal?
Yes
1. Check connecter
(#1,#2 and #3 of CN 22)
1. Check the sensor is frozen during the winter.
2. Check the output voltage. (Normal state : 0.3~2.8V)
3. Replace the PCB if power is not supplied.
Description
Yes
Check leaking in unit
NO
Replace the water pressure sensor
Check method