![](/images/new-backgrounds/1014520/1452031x1.webp)
8-4. Troubleshooting check table
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and the following detection method has detected an abnormality (the first detection after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR lamp flashing.
| Lighted | ·Flashing of OPERATION INDICATOR lamp | |
OPERATION INDICATOR | indicates abnormalities. | ||
Blinking | |||
|
| ||
| Not lighted |
|
No. | Abnormal | Operation indicator lamp | Symptom | Condition | Correspondence | |
| point |
|
|
|
| |
|
| Left lamp flashes. | Indoor unit |
|
| |
|
| • Refer to | ||||
|
| and outdoor | The serial signal from the outdoor unit is not | |||
1 | or serial |
| ||||
| unit do not | received for a maximum of 6 minutes. | ||||
| signal |
| error". | |||
|
| operate. |
| |||
|
|
|
|
| ||
|
|
|
|
| ||
| Outdoor |
|
|
| • Check the blinking pattern of | |
| control |
|
| It cannot properly read data in the nonvolatile | ||
| system |
| Outdoor unit | the LED on the inverter P.C. | ||
|
| memory of the inverter P.C. board or the | ||||
2 | Left lamp lights up | board or the outdoor | ||||
does not | outdoor electronic control P.C. board. | |||||
|
| operate. |
| electronic | ||
|
|
| control P.C. board. | |||
|
|
|
|
| ||
|
|
|
|
| ||
| Indoor coil | Left lamp flashes. |
|
|
| |
| thermistor |
|
|
| ||
| Indoor unit | The indoor coil or the room temperature | • Refer to | |||
|
| |||||
3 |
|
| and outdoor | thermistor is short or open circuit. | characteristics of indoor coil | |
Room |
| unit do not |
| thermistor, and the room | ||
| tempera- | operate. |
| temperature thermistor. | ||
| ture |
|
|
| ||
|
|
|
|
| ||
| thermistor |
|
|
|
| |
|
| Left lamp flashes. | Indoor unit |
|
| |
|
| The rotational frequency feedback signal is | • Refer to | |||
| Indoor fan |
| and outdoor | |||
4 |
| not emitted during the indoor fan operation. | ||||
motor |
| unit do not | indoor fan motor". | |||
|
|
| ||||
|
|
| operate. |
|
| |
|
|
|
|
| ||
| Indoor | Left lamp flashes. | Indoor unit | It cannot properly read data in the nonvolatile |
| |
|
| |||||
| and outdoor | • Replace the indoor electronic | ||||
5 | control |
| memory of the indoor electronic control P.C. | |||
| unit do not | control P.C. board. | ||||
| system |
| board. | |||
|
| operate. |
| |||
|
|
|
| |||
|
|
|
|
| ||
|
| Left lamp flashes. | Indoor unit | It consecutively occurs 3 times that the | • Refer to "How to check of | |
| Outdoor | |||||
| inverter/ compressor". | |||||
6 | power |
| and outdoor | compressor stops for overcurrent protection or | Refer to outdoor unit service | |
| unit do not | |||||
| system |
| manual. | |||
|
| operate. | ||||
|
| • Check the stop valve. | ||||
|
|
|
| |||
|
|
|
|
| ||
|
| Left lamp flashes. |
|
|
| |
|
| Indoor unit | The outdoor thermistors short or open circuit | • Refer to "Check of outdoor | ||
| Outdoor |
| and outdoor | thermistor". | ||
7 |
| unit do not | during the compressor operation. | Refer to outdoor unit service | ||
thermistors |
| |||||
|
| operate. |
| manual. | ||
|
|
| ||||
|
|
|
|
| ||
|
| Left lamp flashes. | Indoor unit |
| • Replace the inverter P.C. | |
| Outdoor | It cannot properly read data in the nonvolatile | board or the outdoor | |||
| and outdoor | |||||
8 | control |
| memory of the inverter P.C. board or the | electronic control P.C. board. | ||
| unit do not | |||||
| system |
| outdoor electronic control P.C. board. | Refer to outdoor unit service | ||
|
| operate. | ||||
|
|
| manual. | |||
|
|
|
| |||
|
| Left lamp flashes. | Indoor unit |
| • Confirm the abnormality in | |
| Other | An abnormality other than above mentioned is | ||||
9 |
| and outdoor | detail using the failure mode | |||
abnormality |
| unit do not | detected. | recall function for outdoor | ||
|
| operate. |
| unit. | ||
|
|
|
|
|
16