Haier GE Connect Series Service Manual page 37

Troubleshooting
"H7" Driver Out-of-Step Protection
Error display:
ODU main board LED display
Error judgment condition and method:
The processor cannot detect the compressor rotor
position. The running speed is different that the speed
called for. Either case will stop compressor operation.
Possible causes:
• Compressor 3-phase wire connection is out of phase
or phase-reversed.
• Compressor wiring is out of phase.
• System is blocked, short of refrigerant or compressor
oil.
• Drive board IPM module is damaged.
• Drive board compressor current sampling circuit
element is damaged or drive chip current sampling
AD terminal is abnormal.
• Compressor is damaged.
"HC" PFC Protection
Error display:
ODU main board LED display
Error judgment condition and method:
System shutdown due to drive processor low voltage
malfunction.
Possible causes:
• Power grid voltage is abnormal.
• Drive board PFC module is damaged.
• Drive board IPM module's 15V power supply is lower
than 13.5V.
• Drive board PWM signal for PFC and the
corresponding element are abnormal.
• Drive board PFC current sampling circuit element is
damaged or drive chip current sampling AD terminal
is abnormal.
Connect wires
according to the
phase sequence
CONNECT SERIES SERVICE MANUAL
Start
H7 Compressor out-of-step protection
Compressor 3-phase wire connection is
lack of phase or phased-reversing?
Yes
No
Compressor phase wire
Fasten or
replace the
compressor
phase wires
Start
GC PFC protection
Check whether power grid
voltage is normal?
Yes
Drive board PFC
is damaged ?
Yes
Replace the
drive board.
connection is bad?
Yes
No
Replace the drive
board
Error still exists?
Yes
Replace the
compressor
No
Normal
protection
35