Flow Chart Of Troubleshooting; Troubleshooting Flow Chart Of Main Control Malfunction - Gree GUHD09NK3FO Service Manual

U-Match Series DC
Inverter Service Manual

2 FLOW CHART OF TROUBLESHOOTING

2.1 Troubleshooting Flow Chart of Main Control Malfunction

E1 High Pressure Protection
E1
protection
Check if the
system high
pressure is
higher than
4.2MPa
Yes
Check if the
liquid valve and
gas valve of
outdoor unit
open
completely
Yes
Check if the air
outlet of outdoor
fan motor or
indoor fan motor
is normal
No
Check if the
indoor and
outdoor operating
ambient
temperature is
within normal
range
82
No
Check if the wiring
No
of high pressure
switch is correct
Completely open the liquid
No
valve and gas valve of
outdoor unit
Clear the obstacle at indoor
Yes and outdoor air outlet or air
return port to ensure smooth
air outlet
Operate the unit in normal
ambient temperature range
specified in user's manual
Reconnect wire according
to the circuit diagram
Check if the high
Yes No
pressure switch
works normally
Yes
Replace the outdoor
mainboard
Replace the high
pressure switch