Airwell SX 12 DCI, Service Manual

Page: 78 / 86

TROUBLESHOOTING
SM YAZ318 1-A.1 GB
12-5
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
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
(based on OMT reading).
Overheating in heating mode
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.