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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5.14. 27Error<br />
Error occurrence conditions and check items.<br />
Error<br />
Description<br />
27E<br />
Air volume<br />
sensor error<br />
If an error (open: 0.1±0.1 V or lower / short-circuit: 4.5±0.2 V or higher) in the air<br />
volume sensor is detected continuously for 3 seconds, or if the air volume sensor<br />
voltage of 1.20 V is detected before pre-purge, the system displays the error<br />
message 27E on the room controller and the PCB.<br />
Check items<br />
Check the assembly of the connector of the air volume sensor.<br />
Check the voltage of the air volume sensor.<br />
During fan motor stop, is the<br />
output voltage of APS normal?<br />
No<br />
Replace APS Check Connector<br />
Yes<br />
Check the voltage between black and white wire of<br />
CN 6: 0.2 - 0.6VDC<br />
During fan motor operation,<br />
is the output voltage of APS<br />
normal?<br />
No<br />
Replace APS<br />
Yes<br />
Check the voltage between black and white wire of<br />
CN 6: 1 - 4VDC<br />
Replace PCB<br />
©<strong>Navien</strong> America Inc. 2010<br />
98<br />
NR/<strong>NP</strong> series service <strong>Manual</strong><br />
Version 2.0