The system pipe is blocked
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?
High-pressure protection
Measure if the pressure switch is
normal？
Replace the mainboard of outdoor unit
Replace the pressure switch Refer to the Instruction Manual for Indoor Unit
Fully open the valve
Cover up the front panel properly
Remove the obstructions
Measure the fan motor and signal input
Measure the swing motor and signal input
Refer to the dial-up of indoor and outdoor unit
Engage the valve body with the coil
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
NO
NO
NO
NO
NO
NO
NO
NO
NO
Yes
NO
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
NO
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