13-2
TROUBLESHOOTING
SM YBD018 1-A.1 GB
No
SYMPTOM
PROBABLE
CAUSE
CORRECTIVE ACTION
9
Unit works in wrong
mode (cool instead of
heat or heat instead of
cool)
Electronics or
power connection
to RV
Check RV power connections, if OK,
Check RV operation with direct 230VAC
power supply, if OK,
Replace outdoor controller.
10
All components are
operating properly but no
cooling or no heating
Refrigerant leak
Check refrigeration system.
11
Compressor is over
heated and unit does not
generate capacity
EEV problem
Check EEV
12
Units goes into
protections and
compressor is stopped
with no clear reason
Control problem or
refrigeration system
problem
Perform diagnostics (See 13.1.3 below),
and follow the actions described.
13
Compressor motor is
generating noise and no
suction occurs
Phase order to
compressor is
wrong
Check compressor phase order.
14
Water leakage from
indoor unit
Indoor unit drainage
tube is blocked
Check and open drainage tube.
15
Freezing of outdoor
unit in heat mode and
outdoor unit base is
blocked with ice
Connect base heater.
16
Unit operates with wrong
fan speeds or wrong
frequency
Wrong jumper
settings
Perform diagnostics (See 13.1.3 below),
and check if units is operating by
EEPROM parameters.
13.1.2
`Checking the refrigeration system
Checking system pressures and other thermodynamic measures should be done when system
is in Test Mode (in Test mode, system operates in fixed settings). The performance curves
given in this manual are given for unit performance in test mode when high indoor fan speed is
selected.
Entering test mode:
Set unit to Cool/16 degrees/High indoor fan speed, or Heat/30 degrees/High indoor fan speed,
and enter diagnostics.
13.1.3
Judgment by Indoor/Outdoor Unit Diagnostics
Enter diagnostics mode - press for five seconds Mode/Reset button in any operation mode.
Acknowledgment is by 3 short beeps and lights of all Display LED’s. Then, The units will enter
into Indoor and Outdoor unit diagnostic modes.
During the Outdoor unit diagnostics all three Indoor LED’s (STBY/Operate, Filter and Timer)
are blinking. When Indoor diagnostics is displayed, all three LED’s (STBY/Operate, Filter and
Timer) are ON.
When system enters diagnostics mode, only one fault code is shown. Order of priority is from
the lower to the higher number. Diagnostics is continuously ON as long as power is ON. The
current system operation mode will not be changed.
If no fault occurred in the system, no fault code will be displayed during normal operation
mode. The last fault code will be displayed even if the system has recovered from that
fault. The last fault will be deleted from the EEPROM after the system has exit diagnostics
mode.
