Gree GRS-1.5/TD150ANbA-K - Page 58

GREE AIR SOURCE HEAT PUMP WATER HEATER SERVICE MANUAL
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2.2 E4 Air Exhaust Protection
Fault code:
Applicable mode: HOTWATER; SAVE; PRESET; NIGHT
Fault judgment condition and method: E4 is displayed on the wired controller. The troubleshooting
method is shown in the flowchart below.
Possible cause: (1) Air exhaust temperature sensor fault ; (2) Refrigerant leakage of the unit; (3)
Insufficient refrigerant of the unit
Troubleshooting:
E4 air exhaust protection
Check whether the thermo-
bulb resistance is normal.
Check whether refrigerant
is insufficient.
Check whether refrigerant
leakage exists.
Replace the thermo-bulb.
Repair welding and
perfuse refrigerant again.
Add refrigerant to the unit.
N
N
Y
Y
Y
2.3 E6 Communication Fault
Fault code:
Applicable mode: all modes
Fault judgment condition and method: E6 is displayed on the wired controller. The troubleshooting
method is shown in the flowchart below.
Possible cause:
(1) Exception or incorrect connection of the communication cable; (2) Display fault; (3) Mainboard
fault
Troubleshooting: