Troubleshooting 99
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
flue
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.
5.1.11 407Error
Error conditions and Check Items
Error Description
E407
Hot water outlet
Temperature sensor
open / short
If an error (open: 14°F (-10°C) or lower) in the Hot water outlet temperature sensor is detected, the system
displays the 407E error on the front panel. If this occurs, the water heater initiates shutdown.
Check items
1. Check if the Hot water outlet temperature sensor connector is wet due to any reason, including leakage.
2. Check the Resistance of the Hot water outlet temperature sensor.
3. Replace the defected Hot water outlet temperature sensor.
4. Replace the controller.
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