Gree CF01000730, Service Manual

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GREE Duct type split Air conditioner Inverter Series
99
Troubleshooting
：
“J7” 4-way valve protection
Replace the 4-way valve
Yes
Is the voltage of main board
output side normal? (Output voltage of the 4-way valve
during energization is 220V, if the voltage of output
side is insufficient)
Check if the
connection of 4-way valve coil and main
board is correct and firm?
Yes
After confirming the internal
abnormality of 4-way valve
No
Connect it correctly and firmly
No
Replace the main board
Start the unit, detect if the pressure
difference of system high and low pressure is
over 0.1MPa, and touch the four pipes of the 4-way valve
with hands to observe the cold/heat status: in cooling mode,
pipe E and S is in low temperature and low pressure status,
pipe D and C is in high pressure and high temperature status; in
heating mode, pipe D and E is in high pressure and high
temperature status, pipe S and C is in low
temperature and low pressure status
Yes
Yes
(31) “L1” Indoor fan protection
Error display: wired controller of IDU and the dash receiver of IDU will display .
Error judgment condition and method:
Check if the rotation speed of IDU is too slow, or it stops rotation, or protection signal of outdoor fan
is transferred. If yes, it is judged that indoor fan protection occurs.
Possible reason
：
1) Motor stops operation or it is blocked.
2) IDU mainboard is abnormal.