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H6/P4 (High compressor discharge temperature(T5) protection)
Diagnosis Handling
Yes
Check whether discharge temp.
sensor T5 resistance is normal,
refer to TABLE2
Yes
Check whether position of
discharge temp. sensor is
normal. whether there’re other
heat sources around
No
Whether compressor is
normal（abnormal noise，
abnormal vibration）
No
No
In heating mode,check whether
compressor gas return pressure
is too low so that there’s
vacuum phenomenon
No
Replace air discharge
temp. sensor
No
Troubleshooting
problems and restart
Yes
Filling refrigerant and
restart
Yes
Replace compressor
Yes
Replace EXV (valve
sticking)
Replace the mainboard
Yes
No
HH/PH (low discharge superheat protection)
Diagnosis Handling
Check whether T3，T5 are
abnormal (refer to sensor fault
testing)
No
No
In cooling mode,whether there’s
TXV or EV adjusting for indoor
unit and the suction superheat
is normal
Yes
In heating mode, reporting fault
To check whether outdoor fan is
normal,outdoor unit is sheltered
Yes
Restart and heating, after
45min, check whether the
external EV action is normal
(If air discharge superheat)
Replace sensors
Yes
Yes
1.Not applicable for piston
2.Adjust the TXV for full
evaporation and superheat
3.To further adjust TXV swich to
SW4-4”ON”
No
Replace the mainboard
No
Troubleshoot outdoor
fan (replace the fan
motor or fan blade)
No
Replace outdoor EV
Yes
Yes
CE/P1 (High pressure switch(HPS)protection)
Diagnosis Handling
Yes
Check whether high pressure
switch resistance is normal
(COSL is normal)
Yes
Yes
Cooling mode refers to F3/P5
Heating mode refers to F5/Hb
No
Replace high pressure
switch
No
Yes
No
Check whether indoor unit is
normal, valve is blocked or
filter is sheltered, indoor airflow
is normal
Exclude indoor unit fault
reasons and restart
Check whether the service
valves are open
Open the service valve
Check whether refrigerant
system is lack of refrigerant
according to subcooling in
charge model (force mode)
Check whether the service
valves are open
Open the service valve
Check whether outdoor unit is
sheltered
remove impurities around
outdoor unit
C6/Pc (Reversing valve fault protection)
Diagnosis
Handling
Yes
Yes
Yes
No
No
Yes
Check whether the running
model is normal (heating mode
for Heat Pump)
Adjust control for system
Check whether reversing
valve is normal for admand
Check whether reversing
valve is normal for actor
Restart to Check whether
there’s the same fault
Replace the reversing
valve electric coil
Replace the reversing
valve
No
Kee operating
kee operating
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