Self-Diagnosis - Navien NR-35D User Manual

Self-Diagnosis

Error Code
Flame failure
E003
E004 False flame
Misfire
E012
Heat exchanger overheated
E016
Heat exchanger overheat detector
E046
malfunction
Heating circuit line malfunction
E049
Gas Valve malfunction
E056
fan malfunction
E109
E110 Exhaust gas pipe blockage
Air pressure sensor malfunction
E127
Air pressure sensor connecting hose
E157
malfunction
Heating supply temperature sensor
E205
malfunction
Heating flow switch malfunction
E213
(system for Closing to atmosphere)
Pipe leakage
E250
Frozen pipe
E255
Problems Self-diagnose
Check if gas valve is open and switch the boiler off then on.
Check if gas valve is open and Reset the boiler
Please switch off the boiler for about 30 min before restarting.
Please reset the boiler
Please check if there are any problems (dents, blockage, etc.)
on the exhaust pipe, reset the boiler
Please reset the boiler
Recharge heating water according to 'Water recharging
method' in the user manual, then reset the boiler
Please check the leakage in the pipes (Boiler heating pipes,
distributor etc.), then reset the boiler
Please melt frozen water in the heating pipe while boiler is
switched off. and then Reset the boiler
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