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Alarms displayed Cause Solution
P03 Anomalous compressor discharge temperature > o = at 103 °C.
Check cooling cycle (possibly excessive refrigerant charge). Check
opening of cooler taps.
Check TD compressor delivery sensor and replace it if needed.
P04 External unit high pressure switch tripped.
In the summer cycle, check the free circulation of air on the outdoor
unit. Check the refrigerant charge.
In the winter cycle, check that the refrigerant taps are open.
P05
One of phases missing or incorrect connection of power phases in
three-phase versions. No neutral in single-phase versions.
Check for presence and sequence of R, S and T phases and that the
device is not powered with two phases in one-phase systems.
P10
Electrical jumper on connector CN034 of PAW-ACXA73-38670 board
missing or disconnected.
Check connection.
P11
Electric jumper on connector CN068 of PAW-ACXA73-38670 board
missing or disconnected.
Check connection.
P15 Insucient refrigerant charge. Check the cooling circuit to locate the possible leakage.
P16 Excessive compressor draw. Check values of resistors.
P19 Four-way valve jammed. Check electric power and operation of the four-way valve.
P20 High refrigerant pressure protection.
Check the cleanness of the external heat exchanger and respect of
minimum clearances.
Check fan operation and correct air exhaust from the condenser.
P22
External fan motor not working correctly. External fan inverter circuit
protection tripped.
Check free fan movement. Replace fan motor inverter board.
P26 Compressor inverter circuit protection tripped. Disconnect and reconnect power to the device and check that the
compressor starts up correctly.
Check inverter board wiring and replace it, if needed.
Cooling problem of the radiating plate of the inverter board. Check
cleanness of the heat sink.
Check electric connections of the compressor.
P29 Compressor not working properly.
H01 Surge detected by inverter board of the compressor.
H05 External unit control board software to be updated. Contact Technical Service Centre for replacement.
H31 HIC driver board malfunction Contact Technical Service Centre for replacement.
F01
Liquid sensor E1 on indoor unit disconnected, interrupted or short-cir-
cuited.
Check sensor and replace it, if needed.
F02
Condensation sensor E2 sensor on indoor unit disconnect-ed, interrup-
ted or short-circuited.
Check sensor and replace it, if needed.
F04
Compressor delivery sensor TD disconnected, interrupted or short-cir-
cuited.
Check sensor and replace it, if needed.
F06
Liquid sensor C1 on external unit battery disconnected, interrupted or
short-circuited.
Check sensor and replace it, if needed.
F07
Condensation sensor C2 on external unit battery disconnected, inter-
rupted or short-circuited.
Check sensor and replace it, if needed.
F08
External temperature sensor TO disconnected, interrupted or short-cir-
cuited.
Check sensor and replace it, if needed.
F10
Adjustment signal connection from controller disconnected, interrupted
or short-circuited.
Check the connection of the Tout connector and the INN-PDC_03 con-
troller to the CN104 connector on the PAW-ACXA73-38670 board.
F12
Compressor intake sensor TS disconnected, interrupted or short-circu-
ited.
Check sensor and replace it, if needed.
F29 Indoor unit EEprom problem.
Disconnect and reconnect to the device and check for correct operation.
Replace the EEprom of the PAW-ACXA73-38670 board.
F31 Indoor unit EEprom problem.
Disconnect and reconnect power to the device and check correct opera-
tion. Replace and reprogram the external unit board.
L02 Parameter incompatibly between internal and external unit.
Check the automatic settings of the address again. Contact Technical
Service Centre to run programming again.
L08 No setting in the indoor unit.
L09 No setting in the indoor unit.
L10 No setting in the indoor unit.
L13 Incorrect settings of parameters in the indoor unit.
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