11
TROUBLESHOOTING
P1/H2
( High pressure switch protection )
Diagnosis
Handling
P2/H5
(Low pressure switch protection
）
Diagnosis
Handing
Use the pressure gauge to
detect the system pressure to
see if the change is normal
The pressure switch has damaged,
and replace it with a new one
Check if the liquid pipe in
the system is blocked
Remove dirty and keep it unobstructed
Check if there’s too much
refrigerant in the system
Discharge some refrigerant
from the system
No
Discharge the refrigerant,
vacuum, recharge refrigerant
Check if there is too much
Air or N2 in the system
No
No
Yes
Yes
Yes
Yes
Check if the gas pipe in
the system is blocked
No
Remove dirty and keep it unobstructed
Check if the refrigerant of
the system is insufficient
Charge some refrigerant into
the system
Yes
Replace the mainboard
Use the pressure gauge to
detect the system pressure to
see if the change is normal
The pressure switch has damaged,
and replace it with a new one
No
No
Yes
Yes
