Service manual

13-6
TROUBLESHOOTING
SM CINCO 1-A.1 GB
13.4.2 Outdoor unit diagnostics and corrective actions
№ Fault Name Fault Description Corrective Action
1 OCT short/disconnect
Thermistor not connected or
damaged
Check Thermistor ( 13.5.13)
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 ( 13.5.14)
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 ( 13.5.15)
10 No communication to Driver Driver fault Check power supply to driver
Check driver communication ( 13.5.16)
11 Compressor IPM Fault / IPM
Driver Pin /
Over current / IPM malfunction Check no obstruction to electrical box and
outdoor coil air inlet
Check Compressor ( 13.5.10)
12 Bad EEPROM EEPROM parameters are
corrupted
Reset the power. If problem still exist replace
PCB only of need to change parameters
13 DC under voltage DC voltage is lower than limit Check if input voltage lower than limit (198VAC),
if not and the problem persists, replace driver.
If voltage is low, recommend the customer to fix
the power supply
Check driver ( 13.5.5)
Check DC capacitors ( 13.5.7)
14 DC over voltage DC voltage exceeds its high limit Check if input voltage higher than limit
(264VAC), if not and the problem persists,
replace driver.
If voltage is high, 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 lower than limit
(<198VAC) or higher (>264V), if not and the
problem persists, replace driver.
If voltage is 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
May caused by persisitng non communication
between indoor and outdoor unit.
17 No Communication to IDU IDU-ODU communication Check communication between indoor and
outdoor units ( 13.5.17)
18 System Over Power Protection – not available -
19 PFC Current sensor Driver fault Replace Compressor Driver
20 Heat sink Over Heating Compressor stopped due to heat
sink protection
Check that the airflow around the ODU is free
and the fan is running free
Check the screws connecting the driver to heat
sink are tighten
Check outdoor fan motors ( 13.5.9)
21 Deicing During deicing procedure Normally no action is required
If the problem persists for more than twice
on each hour, check for refrigerant leak and
thermodynamic operation ( 13.3)