Navien NCB-180, Service Manual

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5.2.15 353Error
Error conditions and Check Items
Error Description
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
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
Check method
Fault Possible Causes Check method
Anormal water
pressure sensor
Defective water
pressure sensor
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.
NO
Yes
Leaking in unit
Check leaking in unit
1. Check connecter
(#1,#2 and #3 of CN 22)
Is the water
pressure sensor
normal?
Yes
Replace the water pressure sensor
NO