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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5.13. 22Error<br />
Error occurrence conditions and check items.<br />
Error<br />
Description<br />
22E<br />
Heat exchanger<br />
input<br />
temperature<br />
sensor<br />
shortcircuit<br />
If an error (short-circuit: 120 or higher) in the heat exchanger input temperature<br />
sensor is detected, the system displays the 22E error message (cleared automatically)<br />
on the remote controller and the PCB. The boiler maintains the Safety-Shutdown<br />
status.<br />
Check items<br />
1. Check if the heat exchanger input temperature sensor connector is wet due to<br />
any reason, including leakage.<br />
2. Replace the defected heat exchanger input temperature sensor.<br />
3. Replace the PCB.<br />
Is the hot water thermistor 1<br />
normal?<br />
No<br />
Replace hot water thermistor 1<br />
Yes<br />
Resistance between two red wires of CN 13 is from<br />
0.8 to 20k ohm at normal condition.<br />
Check connector<br />
Caution: Before measuring resistance of the thermistor,<br />
remove the connector from the PCB.<br />
©<strong>Navien</strong> America Inc. 2010<br />
96<br />
NR/<strong>NP</strong> series service <strong>Manual</strong><br />
Version 2.0