Navien NHB-055, Руководство по обслуживанию

Страница: 106 / 147

106 NHB Service Manual Version 1.0
Check method
Fault Possible Causes Check method
110E
Exhaust blockage
Abnormal flow of intake
air supply / exhaust
1. If 110E occurs intermittently during ignition or combustion, compare the
standard RPM with the current RPM at Min / Max combustion (dip switch
1-1&1-2). If the current RPM is higher than normal, check the following:
●
Air supply / exhaust vent for any blockages.
●
Blocked condensate drain
●
If the air pressure sensor hose is broken or clogged.
2. Replace the old PCB with the latest version.
Condensate drain error Condensate drain error
Exhaust air is blocked due to condensate drain error.
●
Check if the condensate hose or the siphon is frozen.
●
Check if the condensate hose is kinked.
●
Remove bottom of trap and verify it is not blocked.
Defective air supply /
exhaust flue
Deformed or clogged flu
1. Check the exterior of the flue for damage and obstructions.
2. Check if rainwater is collected due to vertical installation of the air intake pipe.
Exhaust gas flows in
through the supply pipe
If the exhaust gas enters into the air supply pipe, abnormal combustion may cause
E110.
●
Check the installation of the flue.