Service manual

TROUBLESHOOTING
No SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION
Indoor coil block Clean filters and/or remove block
Outdoor coil block
Remove block and/or avoid air by-
pass
EEV problem Check EEV (12.4.7)
11.
Compressor is over heated and unit does
Refrigerant leakage
Indoor coil bl
ock
Check refrigeration system (12.2)
Clean filters and/or remove block
not generate capacity
Outdoor coil block
Remove block and/or avoid air by-
pass
12. Compressor stops during operation
Electronic control
Check diagnostics (see 12.3
belo
w)
Refrigerant leakage Check refrigeration system (12.2)
13. Not all units are operating Communication problems
Check diagnostics (see 12.3
belo
w)
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 coo
ling or no heating
Refrigerant leak Check refrigeration system (12.2)
17.
Compressor motor is generating noise
and n
o suction occurs
Phase order to compressor
is wrong
Check compressor phase order
18.
Freezing of outdoor unit in heat mode
and o
utdoor 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 no
ise 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 unit
s
Check diagnostics (see 12.3
below)
12.2 Checking the refrigeration system
Checking system pressures and other thermodynamic measures should be done when system
is in technician Mode where the system operates as in fixed settings. The performance curves
given in this manual are given for unit performance in Technician mode when high indoor fan
speed is selected.
For entering technician mode check 11.7.
12.3 Diagnostics
12.3.1 Outdoor unit diagnostics and corrective actions
No Fault Name Fault Description Corrective Action
1 OCT bad Thermistor not connected or damaged Check Thermistor ( 12.4.8)
2 CTT bad
3 HST bad
4 OAT bad
5 TSUC bad
6 RGT bad
7 OFAN/Compressor
Feedb
ack Loss
OFAN halls or wires bad. Compressor
wire cable bad or IPM bad or compresor
bad
Check OFAN motor ( 12.4.4) and
compressor
(12.4.5)
8 OFAN - IPM fault Over current / Over temperature of
OFAN IPM
Check no obstruction to controller air opening
Check OFAN motor ( 12.4.4)
Check motor t
ype matches motor jumpers in
controller
9 OFAN Lock Fan does not rotate Check OFAN motor ( 12.4.4)
12-2
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