| Trouble Display (primary) | Detailed Trouble Display (by Test Button) | Detailed Error Item |
| Error | Operation | Timer | Error | Operation | Timer |
| Serial Signal Error | Normal | 1 sec blinking | Serial reverse signal error at operation start up | 0.1sec blinking | 0.5sec 2 times | | Normal Serial Reverse Signal can not be received more than 10 seconds >>Releases when it becomes normal |
| Signal reverse signal error during operation | 0.1sec blinking | 0.5sec 3 times | | Normal Serial Reverse Signal can not be received more than 7 sec (after receiving effective reverse transfer signal) >>Releases when it becomes normal |
| Serial forward signal error at operation start up | 0.1sec blinking | 0.5 sec 4 times | | Normal Serial Forward Signal can not be received more than 10 sec >>Releases when it becomes normal |
| Serial forward signal error during operation | 0.1sec blinking | 0.5sec 5 times | | Normal Serial Forward Signal can not be received more than 10 sec ( after receiving effective forward transfer signal) >>Releases when it becomes normal |
| Indoor unit Thermister error | 0.5sec 2 times | 0.1sec blinking | Indoor Temperature Thermister Open | 0.1sec blinking | 0.5sec 2 times | | Thermister detection value is open when AC plug is inserted >>Releases when value becomes normal |
| Pipe Thermister Open or Short | 0.1sec blinking | 0.5sec 3 times | | Thermister detection value is open or short when AC plug is inserted >>Releases when value becomes normal |
| Outdoor unit Thermister error | 0.5sec 3 times | 0.1sec blinking | Discharge Thermister Open or Short | 0.1sec blinking | 0.5sec 2 times | | Thermistor detection value is open or short >>Outdoor unit stops
Releases when it becomes normal |
| Heat Exchanger Thermister Open | 0.1sec blinking | 0.5sec 3 times | | Thermistor detection value is open >>Outdoor unit stops
Releases when it becomes normal |
| Outdoor Temperature Thermistor Open or Short | 0.1sec blinking | 0.5sec 4 times | | Thermistor detection value is open or short >>Outdoor unit stops
Releases when it becomes normal |
| Indoor unit control error | 0.5sec 4 times | 0.1sec blinking | Forced Automatic SW welded | 0.1sec blinking | 0.5sec 2 times | | Forced Auto SW is ON for more than 10 seconds continuously >>Error is indicated while it is ON
Normal Operation other than error indition |
| Main Relay welded | 0.1sec blinking | 0.5sec 3 times | | Serial Reverse Signal is received 1 min. after Main relay becomes OFF >>Error is indicated while serial reverse signal is input on normal operation Normal operation except error indication |
| Power interruption error | 0.1sec blinking | 0.5sec 4 times | | 50/60Hz is not detected after 2 seconds of power ON. >>Error is indicated and unit is stopped |
