Circulation Pump ("A" Series) - Navien NP-180 Service Manual

4.6.19. Circulation Pump ("A" Series)

Navien Part No.
Function
Failure Event
Effects
Error Code
Diagnostic
Color /
Number of wires
©Navien America Inc. 2010
PBSNCWBFTANK_001
1. Pump operates for internal or external hot water circulation.
2. Internal circulation will avoid hot and cold water sandwich and external
hot water circulation delivers hot water to fixtures quickly resulting in water
conservation.
3. Applied to the model of NR-A and NP-A only.
1. Unable to detect or measure water flow rate. (Only circulation mode)
1. The water heater freezing.
2. Abnormal of internal circulation caused by preheating failure.
3. Abnormal of external circulation caused by preheating failure.
E038
1. Visual inspection: check the circulation pump connection wire.
2. Voltage check: Check range of voltage shown below.
N/A
61
NR/NP series service Manual
Check Point P
Version 2.0