13-7
TROUBLESHOOTING
SM FLODCI 2-A.4 GB
13.1.5 Outdoor
Unit
Diagnosits
No
Problem
5
4
3
2
1
1
OCT is disconnected
0
0
0
0
1
2
OCT is shorted
0
0
0
1
0
3
CTT is disconnected
0
0
0
1
1
4
CTT is shorted
0
0
1
0
0
5
HST is disconnected (when enabled)
0
0
1
0
1
6
HST is shorted (when enabled)
0
0
1
1
0
7
OAT is disconnected (when enabled)
0
0
1
1
1
8
OAT is shorted (when enabled)
0
1
0
0
0
9
TSUC is disconnected (when enabled)
0
1
0
0
1
10
TSUC is shorted (when enabled)
0
1
0
1
0
11
IPM Fault
0
1
0
1
1
12
Bad EEPROM
0
1
1
0
0
13
DC under voltage
0
1
1
0
1
14
DC over voltage
0
1
1
1
0
15
AC under voltage
0
1
1
1
1
16
Indoor / Outdoor unit Communication mismatch
1
0
0
0
0
17
No Communication
1
0
0
0
1
18
Reserved
1
0
0
1
0
20
Heat sink Over Heating
1
0
1
0
0
21
Deicing
1
0
1
0
1
22
Compressor Over Heating
1
0
1
1
0
23
Compressor Over Current
1
0
1
1
1
24
No OFAN Feedback
1
1
0
0
0
25
OFAN locked
1
1
0
0
1
26
Compressor Lock
1
1
0
1
0
27
Bad Communication
1
1
0
1
1
13.1.5.1
Outdoor Unit Diagnostics and Corrective Actions
No
Fault
Probable Cause
Corrective Action
1
Sensors failures of all
types
Check sensors connec-
tions or replace sensors.
2
IPM Fault
Electronics HW prob-
lem
Check all wiring and
jumper settings, if OK,
replace electronics.
3
Bad EEPROM
No action, unless special
parameters are required
for unit operation.
4
DC under/over Voltage
Electronics HW prob-
lem
Check outdoor unit pow-
er supply voltage
5
AC under Voltage
Check outdoor unit pow-
er supply voltage
6
Indoor / Outdoor unit
Communication mis-
match
Indoor and Outdoor
controllers are with
different versions
Replace Indoor controller
7
No Communication
Communication or
grounding wiring is not
good.
Check Indoor to Outdoor
wiring and grounding
8
Compressor Lock
Switch unit to STBY and
restart
9
Bad Communication
Communication quality is
low reliability
Check Indoor to Outdoor
wiring and grounding
CONTENTS
