CONNECT SERIES SERVICE MANUAL
34
ENGLISH
Troubleshooting
Yes
No
Yes
“H5” IPM Protection
Error display:
ODU main board LED display
Error judgment condition and method:
Drive processor supply voltage is low. IPM module
malfunction. System will shut down.
Possible causes:
• Compressor 3-phase wire connection has open phase
or is phase-reversed.
• System is overloaded and compressor current is too
high.
• Drive board IPM module is damaged.
• Drive board IPM module’s 15V power supply is lower
than 13.5V.
• Drive board 6-line PWM signal and the corresponding
element are abnormal.
• Drive board compressor current sampling circuit
element is damaged or drive chip current sampling
AD terminal is abnormal.
• Compressor is damaged.
“H6” DC Fan Error
Error display:
ODU main board LED display
Error judgment condition and method:
Main board does not receive the outdoor fan signal
within 30 seconds after outdoor fan run call is initiated
Possible causes:
• Outdoor fan wiring terminal is not correctly
connected to the main board.
• Outdoor fan is damaged.
• Outdoor fan software is incorrect. This can occur after
the outdoor fan has been replaced.
Yes
No
Start
H5 IPM protection
Compressor 3-phase wire connection is
phase reversed or has open phase.
Connect wires
according to the
phase sequence.
Normal
protection
Replace the
compressor
System is heavy loaded?
Compressor current is too high?
Replace the drive
board
Error still exists?
No
Yes
Yes
No
Operate the
unit with the
new motor
Start
Malfunction of discharge
temperature sensor
Check if the control wire
of outdoor fan motor is
connected on the outdoor
main board correctly
Replace the outdoor fan motor
and then restart the unit to see
if there still is malfunction of
outdoor fan motor
Replace the
outdoor main
board
Correctly
connect the
control wire of
fan motor on
the main board
