Flow Chart Of Troubleshooting - Gree DC Inverter Multi VRF Service Manual

DC INVERTER MULTI VRF

2 Flow chart of troubleshooting

2.1 High-pressure protection
High-pressure protection
Use pressure gauge to
measure if the pressure is
really high?
Yes
Check if the operation
mode of indoor unit is
set properly?
Yes
Check if the gas valve
and liquid valve are
fully open?
Yes
Check if the front panel of
outdoor unit is covered
tightly?
Yes
Check if the air inlet and outlet
of the indoor and outdoor
exchanger is smooth?
Yes
Check if the indoor
and outdoor fans run
normally?
Yes
Check if the indoor
swing louver is fully
open?
Yes
Check if the capacity output of
outdoor unit is equal to the
capacity demand of indoor
units?
Yes
Check if the indoor
electronic expansion valve
can work normally
Yes
Check if the indoor /
outdoor filters or radiating
fins are dirty or blocked?
No
The system pipe is blocked
No
Measure if the
pressure switch is
normal
No
No
Refer to the Instruction Manual for
Indoor Unit
No
Fully open the valve
No
Cover up the front panel properly
No
Remove the obstructions
No
Measure the fan motor and
signal input
No
Measure the swing motor and
signal input
No
Refer to the dial-up of indoor and outdoor unit
No
Engage the valve body with the coil
Yes
Refer to the Repair and Maintenance
Focus on checking the inlet and outlet of the connection between indoor units and main
pipe. Also focus on checking the electronic expansion valve of indoor unit and outdoor
unit. Replace the electronic expansion valve, drying filter and other parts
Yes
Replace the mainboard of outdoor unit
Replace the pressure switch
MAINTENANCE
183