Gree GRS-Cm28/NaA-M - Chapter Ⅳ Maintenance; Error Code

Chapter Ⅳ Maintenance（1. Error Code）
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Chapter Ⅳ Maintenance
1. Error Code
Error
code
Error name
Source of
error signal
Control logic
E1
High pressure
protection
High pressure
switch
The high pressure switch is used to detect the high pressure of system
and protect the unit from operating in an abnormal status. When the high
pressure of the system exceeds the set value, the corresponding
compressor will be shut down immediately. 15 sec later, the fan will be
shut down and the error code will be displayed. Operation cannot be
restored automatically. If the error is eliminated after you press the “reset”
button, error is cleared.
E3
Low pressure
protection
Low pressure
switch
Low pressure switch is used to detect the low pressure of the system and
protect the unit from operating in an abnormal status. When the low
pressure of the system is lower than the set value, the compressor and
the fan will be shut down in turn. If the switch is recovered after 3 min,
operation will be restored automatically. If low pressure protection is
detected twice within 40 min, the error code will be displayed and
operation cannot be automatically restored. If the error is eliminated after
you press the “reset” button, error is cleared.
E4
High discharge
temperature
protection
Discharge
temperature
sensor
The discharge temperature sensor is used to prevent unit failure or
damage arising from compressor oil decomposition and carbonization
when system is operating in an abnormal status and discharge
temperature is too high. If the discharge temperature is higher than the
set value (130℃) of discharge temperature protection or the discharge
temperature sensor is disconnected, the corresponding compressor will
be shut down. If the error is eliminated after you press the “reset” button,
error is cleared.
E5
Compressor
overload
protection
Compressor
overload
protector
Compressor overload protection aims to protect the compressor as
regards operation safety. It prevents damage to the compressor arising
from over-high discharge temperature or high-pressure ratio. In case of
compressor overload protection, compressor and fan will be shut down
accordingly. If the switch is recovered after 3 min, operation will be
restored automatically. If compressor overload protection is detected for
3 times within 30 min, the error code will be displayed and system cannot
restore operation. If the error is eliminated after you press the “reset”
button, error is cleared.
E6
Communication
error
Wired
controller
signal cable
When units are connected, one of the units must be set as unit 1. If the
wired controller cannot detect unit 1 in 1 min, the error code will be
displayed. After unit 1 is correctly connected, error code will disappear
and communication is normal.