Navien NCB-24LSWE, Руководство по обслуживанию

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NCB Service Manual 109 Version 1.0
5.2.15 Error 352
Error conditions and checklist
Error Description
E352
High water
pressure
If an error signal is received from the water pressure sensor, the system displays the ‘E352’ on the front
panel. High water pressure errors occur if the water pressure is 3.9 bar or higher for 3 sec.
The error is automatically cancelled if the water pressure returns to 3.9 bar or lower.
Checklist
1. Check if the input water pressure sensor is wet for any reason, including leakage.
2. Check the controller
Testing method
Fault Possible Causes Check method
E352 High water pressure
Check the water supply pressure. (3.9 bar or higher is the error state)
Check if the safety valve is stuck.
Check the Auto feeder valve.
High water
pressure sensor
Water pressure
sensor fault
1. Check the output voltage. (Normal state: 0.25-- 4.93 V)
2. Replace the faulty or open water pressure sensor.