12
TROUBLESHOOTING
P5/H1
( T3 condenser sensor high temp protection )
Diagnosis
Handling
P6
(IPM module protection
）
Diagnosis
Handling
P8/H4
(IPM high temperature protection
）
Diagnosis
Handling
Check if the liquid side of
outdoor system is blocked
Remove dirty and keep it unobstructed
Check if there is too much
Air or N2 in the system
Discharge the refrigerant,
vacuum, recharge refrigerant
No
No
Power off and re-power on
to see whether it is normal
Yes
Yes
If there is still abnormal
replace the mainboard
Power off and re-power on to
see whether it is normal
If there is still abnormal
replace the mainboard
Re-power on to measure the
temperature of the IPM board
Observe the temperature change
If the temperature changes normally, but the final
temperature is too high, remove the IPM heat sink cover
plate, apply heat dissipation silicone grease evenly
again, then tighten the screws to fasten the cover plate
No
Replace the mainboard
IPM heat sink cover plate
should be fastened
