Daikin Sky Air R-407C - Abnormal Low Pressure (Detected by the LPS) (E4)

ESIE02–01 Error Codes: Outdoor Units
Part 3 – Troubleshooting 3–41
33
4
5
1
3.4 Abnormal Low Pressure (Detected by the LPS) (E4)
Error code E4
LED indications The table below shows the LED indications.
Error generation The error is generated when the low-pressure switch is activated during compressor operation.
Causes The possible causes are:
■ Malfunctioning refrigerant piping circuit
■ Malfunctioning low-pressure switch
■ Disconnected or broken low-pressure switch harness
■ Malfunctioning low-pressure switch connector connection
■ Malfunctioning outdoor unit PCB.
LPS settings The table below contains the preset LPS values.
Operation HAP (green) H1P (red) H2P (red)
Normal 688
Malfunction 678
Applicable units Abnormal Reset
R(Y)P71/100/125/200/250B < -0.3 bar > +0.5 bar