Electra DCR 25 Service Manual page 45

TROUBLESHOOTING
12.3.2 Indoor unit diagnosis and corrective actions
No. Fault
Sensor failures of all
1
types
Communication
2
mismatch
No Communication
3
No Encoder
4
5 Outdoor Unit Fault
EEPROM Not
6
Updated
Bad EEPROM
7
Bad Communication Communication quality is low reliabilityCheck Indoor to Outdoor wiring
8
Using EEPROM
9
data
12.3.3 Outdoor unit Diagnostics
No
OCT is disconnected
1
2 OCT is shorted
CTT is disconnected
3
CTT is shorted
4
5 HST is disconnected (when enabled)
HST is shorted (when enabled)
6
OAT is disconnected (when enabled)
7
8 OAT is shorted (when enabled)
TSUC is disconnected (when enabled)
9
TSUC is shorted (when enabled)
10
11 IPM Fault
Bad EEPROM
12
DC under voltage
13
DC over voltage
14
AC under voltage
15
Indoor / Outdoor unit Communication mismatch
16
17 No Communication
Reserved
18
Heat sink Over Heating
20
Deicing
21
22 Compressor Over Heating
Compressor Over Current
23
Reserved
...
27 Bad Communication
12-4
Probable Cause
Indoor and Outdoor controllers are
with different versions
Communication or grounding wiring is
not good.
Indoor electronics or motor
Outdoor controller problem
System is using ROM parameters and
not EEPROM parameters
No problem. System is using
EEPRRRROM parameters
Problem
Revision Y05-01
CONTENT
Corrective Action
Check sensor connections or
replace sensor
Replace Indoor controller
Check Indoor to Outdoor wiring
and grounding
Check motor wiring, if ok,
replace motor, if still not ok,
replace Indoor controller.
Switch to Outdoor diagnostics.
No action, unless special
parameters are required for
unit operation.
No action, unless special
parameters are required for
unit operation.
and grounding
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 1
Service Manual - Delta DCI
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
0
1
1