13-9
TROUBLESHOOTING
SM OU12HP 2-E.2 GB
No Fault Name Fault Description Corrective Action
18
No Communication to
Driver
Driver fault
Check power supply to driver
Check driver communication
(13.5.16)
19 Current sensor Fault Driver fault Replace Compressor Driver
20
Heat sink Over
Heating
Compressor stopped due
to heat sink protection
Check that the airflow around the
ODU is free and the fan is running
free
Check the screws connecting the
driver to heat sink are tighten
Check outdoor fan motors (13.5.9)
21 Deicing During deicing procedure
Normally no action is required
If the problem persists for more
than twice on each hour, check for
refrigerant leak and thermodynamic
operation (13.3)
22
Compressor Over
Heating
Compressor stopped due
to over heat protection
Normally no action is required
If the problem persists for more
than twice on each hour, check for
refrigerant leak and thermodynamic
operation (13.3)
Check the EEV (13.5.12)
Check the Outdoor fans (13.5.9)
Check the Indoor fans (13.5.19)
Check the Compressor (13.5.10)
Check the CTT Thermistor (13.5.13)
23
Compressor Over
Current
Compressor stopped due
to over current protection
Normally no action is required
If the problem persists for more
than twice on each hour, check
for refrigerant leak or clog and
thermodynamic operation (13.3)
Check the EEV (13.5.12)
Check the Outdoor fans (13.5.9)
Check the Indoor fans 13.5.19)
Check the Compressor (13.5.10)
24 OFAN_UP error
Outdoor fan(s) does not
rotate
Check no obstruction to outdoor unit
coil air path
Check OFAN motor (13.5.9)
25 OFAN_DN error
26 Compressor Lock
Compressor does not
rotate
Check if the inrush wiring is
connected and if the if the inrush
circuitry is operating well (13.5.4)
Check Compressor (13.5.10)
Check driver (13.5.5)
Check Zero-cross wiring from driver
to Line Filter (6HP Only)
27 Bad Communication Bad communication lines
Check communication between
indoor and outdoor units (13.5.17)
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