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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Scenario 3<br />
Is gas valve normally<br />
operating?<br />
No Does the main gas valve No Check connector<br />
have proper voltage?<br />
Yes<br />
Check the voltage between two brown<br />
wires (1-2) of CN 15: 83 -120VDC<br />
Does the main gas valve<br />
have proper resistance?<br />
No<br />
Replace gas valve assembly<br />
Yes<br />
Check the resistance between two brown<br />
wires<br />
(1-2) of CN 15: 0.8 -2.4k ohm<br />
Yes<br />
Does the modulating gas<br />
valve have proper<br />
voltage?<br />
No<br />
Check connector<br />
Yes<br />
Check the voltage between two wires of<br />
CN 14 : 2 -10VDC<br />
Is the tube which is<br />
connected with modulating<br />
gas valve properly<br />
installed?<br />
No<br />
Check tube<br />
Yes<br />
Check the flame rod<br />
Check the burner assembly<br />
©<strong>Navien</strong> America Inc. 2010<br />
69<br />
NR/<strong>NP</strong> series service <strong>Manual</strong><br />
Version 2.0