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Störungscode L18_Mini_ECOi

(ECOi-Geräte)

4-way valve operation failure

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

 

 


 

 

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