Gree GWH09ACC-K6DNA1F/I Service Manual page 59

Malfunction of phase
current detection U1
circuit for compressor
Malfunction of voltage
dropping for DC U3
busbar
Malfunction of
complete units current U5
detection
Cold air prevention
E9
protection
Refrigerant recovery
Fo
mode
Undefined outdoor unit
oE
error
Malfunction of
JF
detecting plate(WIFI )
Analysis or processing of some of the malfunction display:
1. Compressor discharge protection
Possible causes: shortage of refrigerant; blockage of air filter; poor ventilation or air flow short pass for condenser; the sys-
tem has noncondensing gas (such as air, water etc.); blockage of capillary assy (including filter); leakage inside four-way
valve causes incorrect operation; malfunction of compressor; malfunction of protection relay; malfunction of discharge sen-
sor; outdoor temperature too high.
Processing method: refer to the malfunction analysis in the above section.
2. Low voltage overcurrent protection
Possible cause: Sudden drop of supply voltage.
3.Communication malfunction
Processing method: Check if communication signal cable is connected reliably.
4. Sensor open or short circuit
Processing method: Check whether sensor is normal, connected with the corre sponding position on the controller and if
damage of lead wire is found.
5. Compressor over load protection
Possible causes: insufficient or too much refrigrant; blockage of capillary and increase of suction temp.; improper running of
compressor, burning in or stuck of bearing, damage of discharge valve; malfunction of protector.
Processing method: adjust refrigerant amount; replace the capillary; replace the compressor; use universal meter to check if
the contactor of compress or is fine when it is not overheated, if not replace the protector.
6. System malfunction
i.e.overload protection.When tube temperature(Check the temperature of outdoor heat exchanger when cooling and check
the temperatur e of indoor heat exchanger when heating) is too high, protection will be activated.
Possible causes: Outdoor temperature is too high when cooling; insufficient outdoor air circulation; refrigerant flow malfunc-
tion.
please refer to the malfunction analysis in the previous section for handling method .
7. IPM module protection
Processing method:Once the module malfunction happens,if it persists for a long time and can not be selfcanceled, cut off
the power and turn off the unit,and then re-energize the unit again after about 10 min.After repeating the procedure for sever
times, if the malfunction still exists,replace the module.
56
During cooling and drying operation,
compressor will stop while indoor fan will
operate;
During heating operation, the complete
unit will stop
During cooling and drying operation,
compressor will stop while indoor fan will
operate;
During heating operation, the complete
unit will stop
During cooling and drying operation, the
compressor will stop while indoor fan will
operate;
During heating operating, the complete
unit will stop operation.
Cool: compressor and outdoor fan stops
operation, while indoor fan operates;
Heat: compressor, outdoor fan and indoor
fan stop operation.
Loads operate normally, while the unit
can't be normally controlled by APP.
Replace outdoor control panel AP1
Supply voltage is unstable
Theres circuit malfunction on outdoor units control panel
AP1, please replace the outdoor units control panel AP1.
Not the error code. It's the status code for the
operation.
Refrigerant recovery. The Serviceman operates it for
maintenance.
1. Outdoor ambient temperature exceeds the operation range
o
of unit (eg: less than-20 C or more than 60
more than 30 o C for heating);
2. Failure startup of compressor?
3. Are wires of compressor not connected tightly?
4. Is compressor damaged?
5. Is main board damaged?
1. Main board of indoor unit is damaged;
2. Detection board is damaged;
3. The connection between indoor unit and detection board is
not good;
o
C for cooling;
Installation and Maintenance