1. Error Detection Method
- It is judged an error whenever the outdoor unit receives the signal “O2 Alarm Occurred” from the indoor unit.
- With the indoor unit's EEPROM setting (item code 0B) set to 0001, the EXCT input was shorted.
2. Error Diagnosis
|1-1||Is an O2 sensor being used?||Yes||3-1|
Indoor unit’s EEPROM setting
|2-1||Is the indoor EEPROM setting, item code 0B, on the indoor unit’s control PC board set to 0001?||
|After correcting the set-ting, 3-1|
|3 Indoor EXCT wiring||3-1||Is the indoor EXCT socket (wire) shorted?||Yes||Correct wiring|
|4 Indoor unit’s control PC board||4-1||Is the alarm triggered if the indoor EXCT socket (wire) is disconnected, and the power is reset?||Yes||4-3|
|4-2||Since there is no error, see what happens.|
|4-3||Indoor unit control PC board error replace PC board.|