45Error - Navien NP-180 Service Manual

5.25. 45Error

Error occurrence conditions and check items
Error
In NR/NP type, check the condition of bypass mixing valve when supply power,
turn R/C on/off, or stop burner operation. When bypass mixing valve is noticed
in abnormal condition, display 45E.
45E
Display error code when bypass Mixing valve cannot close.
Bypass
(Display 16.01 at PCB – generally step motor of bypass mixing valve is in abnormal
Mixing
condition.)
Valve error
Display error code when bypass Mixing valve cannot open.
(Display 16.02 at PCB – generally wire of mixing valve is disconnected or feedback
sensor of bypass mixing valve is in abnormal condition.)
1. Check the connector is connected between bypass mixing valve and PCB.
2. Defective Mixing trans.
Check items
3. Defective Bypass Mixing valve
4. Defective PCB.
©Navien America Inc. 2010
Description
119
NR/NP series service Manual Version 2.0