Airwell AW-HJD009-N11, Service Manual

Page: 99 / 132

13.4.2 Outdoor unit diagnostics and corrective actions
No Fault Name Fault Description Corrective Action
1 OCT short/disconnect
Thermistor not connected
or damaged
Check Thermistor ( 13.5.10)
2 CTT short/disconnect
3 HST short/disconnect
4 OAT short/disconnect
5 OMT short/disconnect
6 RGT short/disconnect
7 RLT short/disconnect
8 High pressure protection
Compressor stopped due
to high pressure protection
Normally no action is required
If the problem persists for more than
twice on each hour, check for
refrigerant clog.
Check the switch operation (
13.5.12 )
9 Low pressure protection
Compressor stopped due
to low pressure protection
Normally no action is required
If the problem persists for more than
twice on each hour, check for
refrigerant leak.
Check the switch operation (
Error!
Reference source not found. )
10
No communication to
Driver
Driver fault
Check power supply to driver
Check driver communication (
Error!
Reference source not found. )
11
Compressor IPM Fault/
IPM Driver Pin/
Compressor Current
Sensor Fault
Over current / IPM
malfunction
Check no obstruction to electrical
box and outdoor coil air inlet
Check Compressor (
13.5.7 )
12
No Water Flow (For
Hydro Units only)
NA NA
13 Refrigerant Leakage NA NA
14 DC Under/over voltage
DC voltage exceeds its
limit
Check if input voltage out of limit, if
not and the problem persists,
replace driver.
If voltage is high/Low, shut off the
power and recommend the customer
to fix the power supply
15
AC under voltage/AC
over Voltage/Zero
Crossing
AC input voltage is
lower/higher than limit
Check if input voltage is out of limit,
if not and the problem persists,
replace driver.
If voltage is High/low, recommend
the customer to fix the power supply
16
Mismatch between IDU &
ODU models Mismatch between IDU
and ODU models
Indoor unit sizes are exceeding
outdoor unit capacity, check indoor
units model plugs. Eigther too high
or too low capacity indoor units
Missing ODU configuration ODU dip switches are not
configured correctly Check ODU dip switch setting if
correct.
Undefined ODU Model
17
No Communication to
IDU
IDU-ODU communication
Check communication between
indoor and outdoor units (
Error!
Reference source not found. )
18 System Over Power Protection – not available -
19
PFC Current sensor
Driver fault Replace Compressor Driver
Missing phase
Installation incorrect
Check power supply lines
Phase order mismatch
Switch between 2 supply lines
TROUBLESHOOTING
1
3
-10
SM
HJD
DCI 1-A GB
7