Navien NCB-150E, Руководство по обслуживанию

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Version 1.4 118 NCB-E Service Manual
5.2.15 352Error
Error conditions and Check Items
Error Description
E352
High water pressure
Upon receiving a signal from the water pressure sensor, the system displays the error(E352) on
front panel.
High water level error if the water level of 56.6 psi or higher continues 3 seconds.
Error is automatically cancelled if water level is 43.5 psi or lower.
Check items
1. Check if the cold water pipe input water pressure sensor is wet due to any reason, including
leakage.
2. Check the Auto Feeder Sensor.
3. Check the controller.
Leaking in unit
Is the water
pressure sensor
normal?
1. Check connecter
(#1,#2 and #3 of CN 22)
Check leaking in unit
Replace the water pressure sensor
Yes
No
Yes
No
Check method
Fault Possible Causes Check method
E352 High water pressure
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.
High water pressure
sensor
Defective water pressure
sensor
1. Check the output voltage. (Normal state : 0.3-2.8V)
2. Replace the defective or opened water pressure sensor.
Defective Auto Feeder
valve
1. Check the Auto feeder valve. (refer to page80)