13-11
TROUBLESHOOTING
SM LEXDCI 1-E.1 GB
No
Symptom
Probable Cause
Corrective Action
7
Outdoor unit display board and
leds are off
No power supply
Check the connections
and the wiring on the main
terminal - Repair if needed.
PFC Chock coil
Check the PFC Chock coil
Burnt fuse
Check 20A fuse on the Filter
8
Compressor operates but no
capacity
EEV problem
Check EEV
Refrigerant leakage
Check refrigeration system
Indoor coil block
Clean filters and/or remove
block
Outdoor coil block
Remove block and/or avoid
air by-pass
9
Compressor is over heated and
unit does not generate capacity
EEV problem
Check EEV
Refrigerant leakage
Check refrigeration system)
Indoor coil block
Clean filters and/or remove
block
Outdoor coil block
Remove block and/or avoid
air by-pass
10
Compressor stops during
operation
Electronic control
Check diagnostics
Refrigerant leakage
Check refrigeration system
11
Unit is not operating
Communication
problems
Check diagnostics
12
Compressor does not start
Electronics control
problem or protection
13
Unit works in wrong mode (cool
instead of heat or heat instead of
cool)
Electronics or RV
problem
Check RV
14
All components are operating
properly but no cooling or no
heating
Refrigerant leak
Check refrigeration system
15
Compressor motor is generating
noise and no suction occurs
Phase order to
compressor is wrong
Check compressor phase
order
16
Freezing of outdoor unit in heat
mode and outdoor unit base is
blocked with ice
Connect base heater
17
The unit stop suddenly during
operation
EMC interference to the
A/C unit
Check for EMC problems
18
Indoor unit(s) Indicator(s) leds
may flicker
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