Navien NCB-150E, Руководство по обслуживанию

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Version 1.4 96 NCB-E Service Manual
Check method
Failure mode Cause Check method
Flame before/after
combustion
Leakage from main gas
valve
Replace the gas flame if flame occurs before combustion or if there is remaining flame
after combustion is stopped.
Error before/after
combustion
Discharge of electricity
from electrode
Spark discharges from electrode to flame sensor at ignition.
●
Replace or correct location of flame detecting rod.
Gas valve
Gas may leak as the main gas valve is pushed by the gas supply over the standard
pressure.
●
Check the supply pressure: NG: 3.5" - 10.5” WC, LP: 8.0" - 13.5"W.C
●
If the gas pressure is too high, notify the gas supplier about the issue, and if
necessary, replace the gas valve.
●
If there is a gas leak close the gas supply valve and repair the unit before using the
system.
Other trouble Defective PCB If the issue continues despite the checking of items above, replace the PCB.