EAS ELECTRIC EMCH Serie Manual De Instalación Y Manual De Usuario página 179

18.5.9 P4
When the discharge temperature is higher than 115°C, the system will display P4 protection, the ODUs will be
standby.
When the discharge temperature is lower than 83°C, P4 protection finished and normal operation resumes.
P4: Compressor discharge temperature protection
Refers to the wiring diagram to check whether the
discharge temperature sensor is correctly
connected
Check whether the discharge
temperature is higher than
115°C
Check whether the discharge
temperature sensor is disabled
PCB is damaged
84
Yes
Yes
No
Yes
No
No
Reconnect temperature sensor
Check whether there
is refrigerant leakage
Replace discharge temperature sensor
Replace PCB
Yes
Repair the leakage and
recharge refrigerant
V.2