Electra DELTA 25, Service Manual

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12-4
TROUBLESHOOTING
Revision Y05-01 Service Manual - Delta DCI
12.3.2 Indoor unit diagnosis and corrective actions
No. Fault Probable Cause Corrective Action
1
Sensor failures of all
types
Check sensor connections or
replace sensor
2
Communication
mismatch
Indoor and Outdoor controllers are
with different versions Replace Indoor controller
3
No Communication
Communication or grounding wiring is
not good. Check Indoor to Outdoor wiring
and grounding
4
No Encoder
Indoor electronics or motor Check motor wiring, if ok,
replace motor, if still not ok,
replace Indoor controller.
5
Outdoor Unit Fault
Outdoor controller problem Switch to Outdoor diagnostics.
6
EEPROM Not
Updated
System is using ROM parameters and
not EEPROM parameters No action, unless special
parameters are required for
unit operation.
7
Bad EEPROM
No action, unless special
parameters are required for
unit operation.
8
Bad Communication Communication quality is low reliability Check Indoor to Outdoor wiring
and grounding
9
Using EEPROM
data
No problem. System is using
EEPRRRROM parameters
12.3.3 Outdoor unit Diagnostics
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
… Reserved
27
Bad Communication
1 1 0 1 1