Gree Versati II Series - Comp Low- Pressure Protection E3

65
Air to Water Heat Pump
Service Manual- Versati II Series
MAINTENANCE
(2) Comp Low- pressure Protection E3
Comp Low-pressure Protection E3
Check if comp low-pressure switch
is broken or the wiring is loose.
Check the fans
Replace comp
low- pressure or rewire
yes
no
Check if the fans stop running or reverse
yes
no
Check if the system has leaked
Repair the leakage of system
pipe and add refrigerant
according
to the required volume
yes
(3) Comp Discharge Temp Protection E4
Comp Discharge Temp Protection E4
Measure if the exhaust
temperature of compressor
reaches120℃
Replace the electric
expansion valve
no
yes
yes
no
The refrigerant of the system is
not enough and add refrigerant
according to the required volume
yes
Replace the corresponding
exhaust temperature sensor
Measure if the
resistance of temperature
sensor is correct
yes
Replace the mainboard
of outdoor unit
no
Check if the the electric
expansion valve is blocked
Check if the system has leaked
Repair the leakage of system
pipe and add refrigerant
according to the required volume
no