RDZ PDC FLOOR 12T, Installation Manual

Page: 49 / 64

EN
49
3 .10 Alarms shown on the control panel of the external unit
The external unit control panel shows alarms which may occur
during heat pump operation. Call the Technical Service if alarm
PdC appears on the user interface
Symptoms and inspection points
Alarms Cause Remedy
P01 Jumper on connector CN076 of CR-UXRP71B board missing or
disconnected.
Check connection
P03 Anomalous compressor discharge temperature > o = at 111°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. During cooling cycle, check free circulation of air on the external
unit. Check refrigerant charge.
During heating cycle, check opening of refrigerant taps.
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.
P09 Jumper on connector CN080 of CR-UXRP71B board missing or
disconnected.
Check connection
P10 Jumper on connector CN030 of CR-UXRP71B board missing or
disconnected.
Check connection
P15 Insufficient 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 activated by excessive
temperature on the external condenser.
Check cleanness of external heat exchanger and respect of mini-
mum clearances.
Check operation of the fan and correct disposal of air 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. Check opening of cooler taps.
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 for updating.
H31 Problems of communication between external and indoor
units.
Contact Technical Service for replacement.
F01 Liquid sensor E1 on indoor unit disconnected, interrupted or
short-circuited.
Check sensor and replace it, if needed.
F02 Condensation sensor E2 sensor on indoor unit disconnected,
interrupted or short-circuited.
Check sensor and replace it, if needed.
F04 Compressor delivery sensor TD disconnected, interrupted or
short-circuited.
Check sensor and replace it, if needed.
F06 Liquid sensor C1 on external unit battery disconnected, inter-
rupted or short-circuited.
Check sensor and replace it, if needed.
F07 Condensation sensor C2 on external unit battery disconnected,
interrupted or short-circuited.
Check sensor and replace it, if needed.