Flow Chart Of Troubleshooting; High Pressure Protection - Gree FGR20/BNa-M Service Manual

Duct Type Split Air Conditioner
Service Manual

2 FLOW CHART OF TROUBLESHOOTING

2.1 High Pressure Protection

Compressor High Pressure
Protection
Use pressure gauge to measure the
pressure if it I real high pressure?
Inspect if the operational modes of the
indoor unit are set correctly?
Inspect if the gas and liquid
valves are open?
Check if the outdoor unit
if the panel has been sealed properly?
Check if the ventilation
for the indoor and outdoor units is smooth?
Check if the fans for the indoor and outdoor
units are working?
Check if the swing blades are completely
open?
Check if the capacity output of the outdoor
unit is the same as that of the indoor unit?
Check if the filters or heat exchange fins for
the indoor and outdoor units are
contaminated or jammed?
the system pipes are jammed
52
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Measure if the pressure switch
if it is iproper condition?
No
refer to mode conflict
completely open the valve
install the panel
remove obstacles
measure the fan motor
and the signal input
Check the swing motor
and the signal input
refer to capacity code
refer to maintenance
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
replace main board of the
outdoor unit
replace the pressure
switch