Service manual
13-7
TROUBLESHOOTING
SM CINCO 1-A.1 GB
№ Fault Name Fault Description Corrective Action
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)
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)
24 No OFAN Feedback (Both
OFAN_UP or OFAN_DN)
Outdoor fan(s) does not rotate Check no obstruction to outdoor unit coil air
path
Check OFAN motor ( 13.5.9)
25 OFAN IPM fault / OFAN IPM
Driver Pin
Not available -
26 Compressor Lock Compressor does not rotate Check Compressor ( 13.5.10)
Check driver ( 13.5.5)
27 Bad Communication Bad communication lines Check communication between indoor and
outdoor units ( 13.5.17)
28 Missing ODU configuration ODU dip switch setting in
abnormal
Change setting according table.
29 Undefined ODU Model ODU dip switch setting in
abnormal
Change setting according table.
30 Outdoor/Indoor Coil Over-
heating
Compressor stopped due to over
heating protection
Normally no action is required
If the problem persists for more than twice
on each hour, check for refrigerant clog and
thermodynamic operation ( 13.3)
31 Operation conditions are
exceeded
System is performing out of its
outdoor condition limitiations:
Cooling: >46C , <-11C.
Heating: >30C , <-18C. Indication
only, no action.
Check if indeed the conditions are exceeded.
If not, check OAT thermistor, if OK, check no
obstructions to outdoor air path.
13.4.3 DMSMP (CINCO) Diagnostics
The DMSMP system has 4 IDU LEDs, 1 ODU LED, and 1 Power LED.
Each communication channel is built up from receiving and transmitting channels.
The outdoor controller is the master of communication (always initiated communication) while the DMSMP and indoor are
slave (responds only when it receives).
R
4,
T
4
IDU
4
ODU:
T
O,
R
O
IDU Channel
Selector
MCU
R
4
status
R
3
status
R
1
status
R
2
status
R
3,
T
3
IDU
3
R
2,
T
2
IDU
2
R
1,
T
1
IDU
1
R
O
status
DMSMP
LED
4
LED
3
LED
O
LED
1
LED
2
T
4
, R
4
IDU
4
T
3
, R
3
IDU
3
T
2
, R
2
IDU
2
T
1
, R
1
IDU
1
ODU:
R
O,
T
O
Master
Slave
Slave
Slave