Outdoor unit display LED STATUS
E4 Open or short circuit of outdoor temperature sensor
Outdoor unit display LED STATUS
E5 Compressor volt protection
Yes
Check the voltage of power supply, if the voltage is about 220V, turn off the
power supply to indoor unit and turn it on again after 1 minute
Does the trouble occur again?
Check the DC voltage between pin P & N on the IPM, if the voltage is
310V~380V, it is OK.
No
Replace the outdoor power board
Yes
Is connection to connector of pipe temp. sensor good?
Check the resistance of the temp. sensor according to Annex 1
Repair connector
No
Replace the sensor
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