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