Gree FG20/BNa-M, Service Manual

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52
Duct Type Split Air Conditioner
Service Manual
2 FLOW CHART OF TROUBLESHOOTING
2.1 High Pressure Protection
Compressor High Pressure
Protection
Check if the capacity output of the outdoor
unit is the same as that of the indoor unit?
Check if the swing blades are completely
open?
Check if the fans for the indoor and outdoor
units are working?
Check if the ventilation
for the indoor and outdoor units is smooth?
Check if the outdoor unit
if the panel has been sealed properly?
Inspect if the gas and liquid
valves are open?
Inspect if the operational modes of the
indoor unit are set correctly?
Use pressure gauge to measure the
pressure if it I real high pressure?
the system pipes are jammed
Check if the filters or heat exchange fins for
the indoor and outdoor units are
contaminated or jammed?
Particularly check the inlets and outlets of the main pipes
that are connected with the indoor unit and the electronic
expansion valve of the outdoor unit.Replace the expansion
valve and the dryer filter
.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Measure if the pressure switch
if it is iproper condition?
refer to mode conflict
measure the fan motor
and the signal input
remove obstacles
install the panel
completely open the valve
refer to maintenance
refer to capacity code
Check the swing motor
and the signal input
No
No
No
No
No
No
No
No
No
replace the pressure
switch
replace main board of the
outdoor unit
No
Yes