Navien NPE-180A, Руководство по обслуживанию

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Troubleshooting 81
Failure mode Cause Check method
Flame loss and noise
occurs at ignition
Check if there are any
blockages in the gas
orifice plate.
Ignition failure will occur if the gas orifices are clogged.
●
Remove the gas inlet pipe and check the orifice plate.
Improper air intake air
supply
Rainwater intrusion
Check if rainwater has collected inside the unit from an improperly installed air intake
pipe.
Other trouble
Screw loosening
Tighten the ground connection screws on heat exchanger.
Defective PCB If the issue continues despite checking above items, replace the PCB.
5.1.2 004Error
Error occurrence conditions and check items
Error Description
E04
False-flame detection
1. Pre ignition false-flame
If a flame signal is detected continuously for 3 seconds before combustion (stand-by, pre-purge, pre-
ignition), a false-flame error 04E (automatically cleared) is displayed on the front panel and the system
performs continuous post-purge and operates the pump.
2. Post purge false-flame
If a flame signal is detected continuously for 3 seconds when the system performs post-purge as fuel supply
is stopped, a false-flame error 004E (automatically cleared) is displayed on the front panel and the system
performs continuous post-purge and operates the pump.