Electra LEX 25 DCI Service Manual page 90

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