EAS ELECTRIC EMCH Serie Manual De Instalación Y Manual De Usuario página 176

18.5.6 P1
When the pressure is over 4.4MPa, the system will display P1 protection, the ODUs will be standby.
When the pressure is lower than 3.2MPa, P1 protection is finished and normal operation resumes.
P1: High pressure protection
Refers to the wiring diagram to check whether the
high pressure switch is correctly connected
The wire of high pressure is broken or short circuit
high pressure switch the system running normally
Low heat exchange efficiency, causes may include
dirty heat exchanger, dirty plate type heat
exchanger, abnormal fan operation, water pump
error, too closed outdoors installation, etc.
The high pressure side of the system is blocked,
caused by crushed or bent pipe, blocked filter or
EXV, etc.
PCB is damaged
Yes
No
No
No
No
Reconnect pressure switch
Yes
Replace high pressure switch
Yes
Inspect the system and fix
the error
Yes
Inspect the system and fix
the error
Replace PCB
V.2
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