98 NPE Service Manual
5.1.10 110Error
Error occurrence conditions and check items
Error Description
E110
Air pressure error
The system senses the air volume and the RPM signal, and displays 110E on the front panel in the following cases:
1. When the initial fan auto-adjust is not performed.
2. When the unit capacity reaches up to 95% of the maximum heat during combustion, and APS is not up the
standard value.
Check items
1. Check if the venturi (burner) hole is clogged.
2. Check if the condensation drain line or the drain is clogged.
3. Check the flue and exhaust to verify proper installation and clearances. (Circulation of exhaust gas generates
noise.)
4. Check if the air supply/exhaust flue is clogged (rainwater may collect inside from an improperly installed air
supply/exhaust pipe).
5. Defective air pressure sensor or PCB.
Yes
Remove all the restrictions in
airflow around unit and check
the vent pipe for obstructions.
Reset or Restart
NO
Is there any restriction
in airflow?
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