innovair Inverter FLEX24 DEV24H2R18, Service Manual

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Possible reason:
Outdoor fan wiring terminal is not correctly connected to the mainboard.
Outdoor fan is damaged.
If it is a new unit or a new motor has been replaced in the unit and the wire connection is correct, then probably
it is the program that goes wrong.
Troubleshooting ：
Malfunction of
discharge
temperature
sensor
Check if the
control wire of outdoor fan motor is
connected on the outdoor
mainboard correctly
Replace the
outdoor fan motor and then
restart the unit to see if there still
is malfunction of outdoor fan
motor
Correctly connect the
control wire of fan motor
on the mainboard
Operate the unit with
the new motor
Replace the
outdoor
mainboard
Yes
No
No
Yes
3.4.12 “H7” Driver Out-of-Step Protection
Error display: ODU mainboard LED displayer
Error judgment condition and method:
During operation, it can’t detect the rotor position and stops output. Or the actual running speed differs too
much from the set running speed. In each case, compressor runs out of step and system stops for protection.
Possible reason:
Compressor 3-phase wire connection is lack of phase or phased-reversed.
Compressor phase wire connection is bad.
System is blocked, short of refrigerant or compressor oil.
Drive board IPM module is damaged.
SERVICE MANUAL
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