Gree U-MATCH B Series, Manual

Page: 79 / 133

U-MATCH SERIES DC INVERTER AIR CONDITIONERS SERVICE MANUAL
76
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
No
Yes
Check if the wiring
of high pressure
switch is correct
Yes
Check if the high
pressure switch
works normally
No
Completely open the liquid
valve and gas valve of
outdoor unit
Check if the
liquid valve and
gas valve of
outdoor unit
open
completely
No
Yes
Yes
Check if the air
outlet of outdoor
fan motor or
indoor fan motor
is normal
Clear the obstacle at indoor
and outdoor air outlet or air
return port to ensure smooth
air outlet
No
Reconnect wire according
to the circuit diagram
No
Replace the high
pressure switch
Yes
Replace the outdoor
mainboard
是
Operate the unit in normal
ambient temperature range
specified in user
’
s manual
Check if the
indoor and
outdoor operating
ambient
temperature is
within normal
range