Error - Navien NCB-24LSWE Service Manual

5.2.15 Error 352

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