13-4
TROUBLESHOOTING
SM YBD018 1-A.1 GB
No.
Fault
Probable Cause
Corrective Action
9
Using EEPROM data
No problem. System is using
EEPRRRROM parameters
13.1.3.3 Outdoor unit Diagnostics
No
Problem
1
OCT is shorted/disconnected
2
CTT is shorted/disconnected
3
HST is shorted/disconnected
4
OAT is shorted/disconnected
5
OMT is shorted/disconnected
6
RGT is shorted/disconnected
7
RLT is shorted/disconnected
8
Reserved
9
Low pressure protection
10
Reserved
11
Compressor IPM Fault / IPM Driver Pin / Compressor Current Sensor Fault
12
Bad EEPROM
13
DC under voltage
14
DC over voltage
15
AC under voltage/AC over Voltage/Zero Crossing detection
16
Mismatch between IDU & ODU models
17
No Communication
18
System Over Power
19
PFC Current sensor
20
Heat sink Over Heating
21
Deicing
22
Compressor Over Heating
23
Compressor Over Current
24
No OFAN Feedback
25
OFAN IPM fault / OFAN IPM Driver Pin
26
Compressor Lock
27
Bad Communication
28
Missing ODU configuration
29
Undefined ODU Model
30
Outdoor/Indoor Coil Overheating
31
Operation conditions are exceeded
13.1.3.4 Outdoor unit diagnosis and corrective actions
No.
Fault
Probable Cause
Corrective Action
1
Sensors failures of all types
Check sensors connections
or replace sensors.
2
IPM Fault
Electronics HW problem
Check all wiring and jumper
settings, if OK, replace
electronics.
3
Bad EEPROM
No action, unless special
parameters are required for
unit operation.
