740Error - Navien NCB-24LSWE Service Manual

5.2.23 740Error

Error conditions and Check Items
Error
If an error (under 2.2kΩ or over 122.2kΩ) in the outdoor sensor is detected continuously for 3 seconds, The
E740
system displays the error message E740 on the front panel. If this occurs, the boiler changes the control
Abnormal
mode from Reset Curve Mode to Normal Mode.
outdoor sensor
1. Check the parameter setting (refer to page 47).
Check items
2. Check the outdoor sensor
Version 1.0
Description
NCB Service Manual 117