98
DC Inverter Multi
VRF Service Manual
2 FLOW CHART OF TROUBLESHOOTING
2.1 High-pressure Protection
High-pressure protection
Use pressure gauge to
measure if the pressure is
really high?
Check if the operation mode of
indoor unit is set properly?
Check if the gas valve and
liquid valve are fully open?
Check if the front panel of
outdoor unit is covered tightly?
Check if the air inlet and
outlet of the indoor and
outdoor exchanger is
smooth?
Check if the indoor and
outdoor fans run normally?
Check if the indoor swing
louver is fully open?
Check if the capacity output of
outdoor unit is equal to the
capacity demand of indoor
units?
Check if the indoor electronic
expansion valve can work
normally
Check if the indoor / outdoor
filters or radiating fins are dirty
or blocked?
The system pipe is blocked
Refer to the Repair and Maintenance
Engage the valve body with the coil
Refer to the dial-up of indoor and outdoor unit
Measure the swing motor and signal
input
Measure the fan motor
and signal input
Remove the obstructions
Cover up the front panel properly
Fully open the valve
Refer to the Instruction
Manual for Indoor Unit
Measure if the pressure switch
is normal˛
Replace the mainboard
of outdoor unit
Replace the pressure switch
Yes
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
No
No
No
No
No
No
No
No
No
YesNo
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
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