12-2
TROUBLESHOOTING
SM YAZDCI 1-A.1 GB
No
SYMPTOM
PROBABLE CAUSE
CORRECTIVE ACTION
9.
Outdoor unit display board and leds
are off
No power supply
Check the connections and the
wiring on the main terminal -
Repair if needed.
Check PFC choke connection -
Repair if needed
PFC Chock coil
Check the PFC Chock coil
( 12.4.3)
Burnt fuse
Check 25A fuse on the Filter
( 12.4.2)
10.
Compressor operates but one or more
units generates no capacity
EEV problem
Check EEV ( 12.4.7)
Refrigerant leakage
Check refrigeration system
( 12.2)
Indoor coil block
Clean filters and/or remove
block
Outdoor coil block
Remove block and/or avoid air
by-pass
11.
Compressor is over heated and unit
does not generate capacity
EEV problem
Check EEV ( 12.4.7)
Refrigerant leakage
Check refrigeration system
( 12.2)
Indoor coil block
Clean filters and/or remove
block
Outdoor coil block
Remove block and/or avoid air
by-pass
12. Compressor stops during operation
Electronic control
Check diagnostics (see 12.3
below)
Refrigerant leakage
Check refrigeration system
( 12.2)
13. Not all units are operating
Communication problems
Check diagnostics (see 12.3
below)
14. Compressor does not start
Electronics control problem
or protection
15.
Unit works in wrong mode (cool
instead of heat or heat instead of cool)
Electronics or RV problem
Check RV ( 12.4.6)
16.
All components are operating properly
but no cooling or no heating
Refrigerant leak
Check refrigeration system
( 12.2)
17.
Compressor motor is generating noise
and no suction occurs
Phase order to compressor
is wrong
Check compressor phase order
18.
Freezing of outdoor unit in heat mode
and outdoor unit base is blocked with
ice
Connect base heater
19.
The unit stop suddenly during
operation
EMC interference to the
A/C unit
Check for EMC problems
( 12.4.10.1)
20.
Indoor unit(s) Indicator(s) leds may
flicker
21.
Other home appliances operation
is faulty such as noise appears in
the television picture, or the picture
is distorted or static occurs in the
radio sound
EMC interference by the
A/C unit
Check for EMC problems
( 12.4.10.2)
22.
All others
Specific problems of
indoor or outdoor units
Check diagnostics (see 12.3
below)
