12-5
TROUBLESHOOTING
SM YAZDCI 1-A.1 GB
No
Fault Name
Fault Description
Corrective Action
20
Heat sink Over Heating
Compressor stopped due to heatsink
protection
Check that the airflow around the ODU
is free and the fan is running free.
Check fan motor ( 12.4.4)
21
Deicing
During deicing procedure
No action required
22
Compressor Over Heating
Compressor stopped due to over
heat protection
Check if gas is missing in the system
23
Compressor Over Current
Compressor stopped due to over
current protection
No action required
24
No OFAN Feedback
No encoder signal can be detected
from the OFAN
Check DC-FAN hall sensor connection/
plug for damage. Check DC-FAN for
any blockage. Measure between U-V,
U-W for resistance using multimeter.
Resistance value should be below
1 OHM. If multimeter display high
resistance, replace DC-FAN motor,
otherewise replace controller.
25
OFAN IPM fault / OFAN
IPM Driver Pin
OFAN IPM module detect shoot-
through current / OFAN IPM driver
control pin is unconditionally latch to
high state
Check DC-FAN hall sensor connection/
plug for damage. Check DC-FAN for
any blockage. Measure between U-V,
U-W for resistance using multimeter.
Resistance value should be below
1 OHM. If multimeter display high
resistance, replace DC-FAN motor.
Return controller if error is persistent.
26
Compressor Lock
No correct drive current can be
detected from the compressor
Check compressor cable or compressor
wire assembly. Make sure the phase
sequence of U-V-W is correctly plug
into the compressor.
27
Bad Communication
Lost of communication from indoor
unit
Check communication wire between
indoor and outdoor unit
28
Missing ODU configuration
All the DIP is set to 0 (the DIP are not
configured).
This problem cannot happen in DCI80.
Previously, this fault is used to detect
model plug that fall down.
29
Undefined ODU Model
The outdoor model is not defined in
the software.
Wrong Outdoor DIP setting.
Too old outdoor software. Update
software
30
Outdoor/Indoor Coil
Overheating
This protection combines the
following:
Overheating in cooling mode
1.
(based on OMT reading).
Overheating in heating mode
2.
based on ICT.
Improper ventilation of the coils
Over charged system
Problem with ICT sensors or OMT
sensor (fake up).
Illegal too small indoor unit’s
installation (heating).
31
Operation conditions are
exceeded
For cooling:
For Heating:
This is not a fault but information on the
ambient operation:
The unit operates outside the defined
operation range.
The OAT fakes and cause false
alarm.
