Gree GRS-S16/Na-M, Service Manual

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HEAT PUMP WATER HEATER (NORTHERN EUROPE) MAINTENANCE
24
UNITS MAINTENANCE
1 ERROR CODE LIST
Code Indication Error Name Cause of Error Code Control Description
E1
Comp High-pressure
protection
Comp High-pressure switch is broken or the wiring is loose.
The water in the tank is not enough.
The installation of tank temp sensor is not correct.
The gas valve and liquid valve are not fully open.
The thermal expansion valve can not work normally.
Press ON/OFF key to clear
E3
Comp Low- pressure
protection
Comp Low-pressure switch is broken or the wiring is loose.
The system has leaked.
The fans stop running or reverse.
Press ON/OFF key to clear
E4
Comp Discharge temp
protection
The resistance of temperature sensor is not correct.
The thermal expansion valve is blocked.
The system has leaked.
Mainboard of outdoor unit is damaged.
Press ON/OFF key to clear
E5 Comp overload protection
AC contactor is damaged.
The compressor wiring is not correct.
The voltage is not normal.
Overcurrent test board is damaged.
The refrigerant of the system is excessive.
Press ON/OFF key to clear
E8 Fan 1 overload protection
Mainboard of outdoor unit is damaged.
The wire connecting the wiring terminals of the mainboard
breaks.
Press ON/OFF key to clear
b8 Fan 2 overload protection
Mainboard of outdoor unit is damaged.
The wire connecting the wiring terminals of the mainboard
breaks.
Press ON/OFF key to clear
F3 Defrost temp sensor failure
The plug on temperature sensor is not correctly connected to the
socket on mainboard.
The resistance of temperature sensor is not correct.
Auto resume
F5 Discharge temp sensor error
The plug on temperature sensor is not correctly connected to the
socket on mainboard.
The resistance of temperature sensor is not correct.
Auto resume
F7
Outdoor ambient temp sensor
failure
The plug on temperature sensor is not correctly connected to the
socket on mainboard.
The resistance of temperature sensor is not correct.
Auto resume
EC Communication malfunction
The communication line of the unit is not connected.
The communication line is not through.
The communication line of the unit is not connected correctly.
The two ends of communication line are not mounted with
magnetic ring.
The outdoor unit is not electrically powered.
Auto resume