Gree CF01000730, Service Manual

Page: 95 / 129

GREE Duct type split Air conditioner Inverter Series
93
Troubleshooting
：
E1 system high pressure
protection
Is the system high
pressure connecting to the
pressure gage over
4.2MPa?
Check if
the cut-off valve of ODU is
completely opened?
Is the panel of ODU
covered completely?
Is the air inlet of
ODU/IDU short circuit or are
there any barriers?
Check the fan operation
of ODU/IDU is normal?
Check if the swing board
of IDU opened completely?
Is the electronic expansion valve
of ODU/IDU operating normally?
Check is the fin
of ODU/IDU dirty and
blocked?
Clean the fin
Check the electronic expansion valve and main board
Check the swing motor and input signals
Replace the main board
Clear the barriers and avoid the short circuit in air inlet
Reinstall the panel of ODU
Open the cut-off valve of ODU completely
Test if the high pressure
switch is normal
Replace the main board of
ODU
Replace the high pressure
switch
Yes
No
No
No
No
No
No
No
Yes No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Is ambient outdoor
temperature over 52
℃
?
No
Protect normally, no treatment
Yes
Check if the input
signals of fan normal?
Replace the motor
No
Yes
Is system pipeline blocked? Re-weld the pipeline
Yes
No
Refrigerant
charging quantity
is too much
Every time after releasing 1kg of refrigerant
and operating for 1.5h consecutively, observe
the system to see if there
’
s protection.
Repeat the operation as above until no
protection occurs any more.
(27) “E3” system low pressure protection
Error display: ODU mainboard, IDU displays .
Applicable model: all models.
Error judgment condition and method
：
Detect the suction pressure of compressor through
pressure sensor of low pressur, when the pressure value is below -41 ℃ , the system will stop operation.
Possible reason
：
1) Cut-off valve of ODU is not opened.