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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5.22. 38Error<br />
Error occurrence conditions and check items.<br />
Error<br />
38E<br />
Pump error<br />
Description<br />
Connect the power, start the pump, and check if the system senses the flow.<br />
If the flow is not sensed after the pump is started, the system displays 38E<br />
(cleared automatically) on the remote controller and the PCB.<br />
Check items<br />
1. Defective flow sensor.<br />
2. Defective pump.<br />
3. Defective PCB.<br />
Is there clod water supply<br />
inside water heater?<br />
No<br />
Supply cold water for water<br />
heater inside<br />
Yes<br />
Circulation PUMP normal<br />
operating?<br />
No<br />
PUMP output voltage<br />
normal?<br />
No<br />
Replace circulation PUMP<br />
Yes<br />
Yes<br />
Check the voltage of CN13:<br />
Over 97V AC<br />
Check water flow sensor<br />
Replace PCB<br />
Or check connector<br />
©<strong>Navien</strong> America Inc. 2010<br />
112<br />
NR/<strong>NP</strong> series service <strong>Manual</strong><br />
Version 2.0