(ECOi-Geräte)
1. Error Detection Method
It is judged an error when during heating operation (Comp. ON), the highest detected temperature at an outdoor unit heat exchanger (C1) was 20°C or more above the outdoor air temperature (Air Temp.) continuously for 5 minutes or longer, or the detected suction temperature (SCT) was 20°C or more above the outdoor air temperature continuously for 5 minutes or longer.
2. Error Diagnosis
| 1 PC board wiring |
1-1 | Is the connector wired from the 4-WAY valve plugged in the CN-20S connector on the HIC PC board properly? | Yes | 1-2 |
| No | Correct connector | |||
| 1-2 | Has the 4-way valve wiring become opened? | Yes | Correct wiring | |
| No | 1-3 | |||
| 1-3 | Is the wire from the coil for controlling the 4-way valve firmly connected to the 4-way valve? | Yes | 2-1 | |
| No | Correct connector | |||
| 2 4-way valve |
2-1 | During heating mode (Comp. ON), insert and remove the connector wired from the 4-WAY valve into or from CN-20S connector on the HIC PC board. At the same time, does the ON & OFF sounds occur from the 4-way valve? | Yes | 2-2 |
| No | Replace HIC PC board | |||
|
2-2 |
During heating mode (Comp. ON), does the alarm code L18 reproduce for 5 minutes or longer after insertion and removal of CN-20S connector wired from the 4-way valve connector on the HIC PC board? | Yes | 2-3 | |
| No | See what happens | |||
| 2-3 | The parts inside the 4-way valve might have fixed at the cooling side. Replace the 4-way valve | |||