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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Check method<br />
Error<br />
Defective Bypass<br />
Mixing Valve<br />
Cause<br />
Connection of<br />
Wire ass’y in fault<br />
Defective<br />
Feedback<br />
Check method<br />
Check the connection of wire to wire connector between bypass<br />
mixing valve and PCB<br />
Check the operation when connect the bypass mixing valve.<br />
(operation checking: supply power, turn R/C on/off,<br />
stop burner operation)<br />
Check the voltage of CN24 (BLACK-RED : DC 7~13V)<br />
- If voltage range is not in normal, check connection of wire,<br />
mixing trans and PCB.<br />
Output voltage of black-white wire of CN24(DC 0 ~13V) is not<br />
change, display 45E(16.02) during checking operation.<br />
- Check the connection of wire to wire connector and reconnect it<br />
- Check the disconnection of white wire<br />
- Check the operation condition of step motor of bypass mixing valve<br />
Defective<br />
Step Motor<br />
Check the connection of wire to wire connector and reconnect it.<br />
Check the mixing trans.<br />
Check the step motor during checking operation<br />
Check the output pulse of pink-orange wire and blue-yellow<br />
wire of CN24.<br />
(PINK-ORANGE : -12 ~ 12 VDC (pulse),<br />
BLUE-YELLOW : -12 ~ 12 VDC (pulse)<br />
Defective Mixing<br />
Trans<br />
Check the voltage between blue and blue wire of CN23 : (14 ~20VAC)<br />
Other trouble<br />
Defective<br />
PCB<br />
If the trouble continues despite the checking of above items,<br />
replace the PCB.<br />
©<strong>Navien</strong> America Inc. 2010<br />
121<br />
NR/<strong>NP</strong> series service <strong>Manual</strong><br />
Version 2.0
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