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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4.6.2. Thermal Fuse<br />
<strong>Navien</strong> Part No.<br />
BH1419012A<br />
BH1419013A<br />
Check Point<br />
N/A<br />
Function<br />
Failure Event<br />
Effects<br />
Error Code<br />
Diagnostic<br />
Color /<br />
Number of wires<br />
1. It protects over limited high temperature in burner due to abnormal operations.<br />
2. The thermal fuse contains solder with a melting point of 383(195).<br />
3. Detects excessive temperature within the unit, especially around the<br />
heat exchanger and combustion chamber. Upon detection, communication<br />
between the PCB and gas valves will sever, shutting down the unit instantly.<br />
1. Unable to detect the excessively high temperature within the unit<br />
1. Flames from burner may penetrate a ruptured/damaged heat exchanger.<br />
2. The water heater is not operating.<br />
N/A<br />
1. Visual inspection: Connection and/or breakage of wires.<br />
2. Voltage check: Check range of voltage shown below.<br />
Black - Black<br />
©<strong>Navien</strong> America Inc. 2010<br />
44<br />
NR/<strong>NP</strong> series service <strong>Manual</strong><br />
Version 2.0
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