352Error - Navien NCB-180 Service Manual

5.2.14 352Error

Error conditions and Check Items
Error
Upon receiving a signal from the water pressure sensor, the system displays the error(E352) on front panel.
E352
High water level error if the water level of 56.6PSI or higher continues 3 seconds.
High water
Error is automatically cancelled if water level is 43.5PSI or lower.
pressure
1. Check if the cold water pipe input water pressure sensor is wet due to any reason, including leakage..
Check items
2. Check the Auto Feeder Sensor
3. Check the controller
Check method
Fault Possible Causes
E352 High water pressure
Defective water
pressure sensor
High water
pressure sensor
Defective Auto
106 NCB Service Manual
Leaking in unit
NO
Is the water
pressure sensor
normal?
Yes
1. Check connecter
(#1,#2 and #3 of CN 22)
Check the pressure increase conditions. (high water pressure of 3.9bar or higher)
Check if the safety valve is stuck.
Check if Auto feeder valve is normal.
1. Check the output voltage. (Normal state : 0.3~2.8V)
2. Replace the defective or opened water pressure sensor.
1. Check the Auto feeder valve. (refer to page76)
Feeder valve
Description
Yes
Check leaking in unit
NO
Replace the water pressure sensor
Check method
Version 1.0