Gree R410A Service Manual page 140

Super Free Match
Service Manual
Low pressure protection
Check the
pressure with a manometer:
is it really low?
Yes
refrigerant in the system: is it
sufficient?
Yes
Check work
mode of indoor unit:
is it properly set?
Yes
Check stop
valves: are they completely
Yes
Check the
panel of outdoor unit: is it
firmly closed?
Yes
Check the
flow of the air inlet/outlet: is
it not blocked?
Yes
Check the
fans of indoor unit and outdoor
unit: is it run?
Yes
Check the
swing louver of indoor unit:
is it completely open?
Yes
Check the
indoor/outdoor filter and heat
exchange fin: is there filth
blockage?
No
Refrigerant pipe is blocked
MAINTENANCE 136
No
Check
No
No
No
open?
No
No
No
No
Yes
Mainly check the inlet and outlet of main pipe connecting
No
Check the
low pressure sensor: is
it normal?
Charge refrigerant according to the amount specified in the
nameplate and calculated additional amount
Refer to Instruction Manual of indoor unit
Completely open the valve
Close the panel
Remove the barrier
Measure the fan motor and signal input
Measure swing motor and signal input
Refer to Care and Maintenance
with each indoor unit and capillary of indoor and outdoor
units. Replace the parts like filter, capillary and so on
Replace the outdoor unit mainboard
Yes
Replace the low pressure sensor