Malfunction Display: Low Pressure Protection - Gree SUPER+ MULTI ULTRA Series Service Manual

3.3 Malfunction display: Low Pressure Protection

Low pressure protection
Check the
pressure with a manometer:
is it really low?
Yes
Check
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
open?
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
Check the
No
low pressure sensor: is
it normal?
No
Charge refrigerant according to the amount specified in the
nameplate and calculated additional amount
No
Refer to Instruction Manual of indoor unit
No
Completely open the valve
No
Close the panel
No
Remove the barrier
No
Measure the fan motor and signal input
No
Measure swing motor and signal input
Yes
Refer to Care and Maintenance
Mainly check the inlet and outlet of main pipe connecting
with each indoor unit and capillary of indoor and outdoor
units. Replace the parts like filter, capillary and so on
Super Free Match
No
Replace the outdoor unit mainboard
Yes
Replace the low pressure sensor
N
Service Manual
125 MAINTENANCE