Specifications
-
86
-
52C secondary side
L2 or L3 phase open?
Repair
YES
NO
Defective outdoor unit PCB
Replacement
(Defective CT circuit)
(1)
(2)
Outdoor unit
Red LED
Green LED
3 time flashes
Stays OFF
NO
Power supply
checked at
L
1
-
L
2
,
L
1
-
L
3
or
L
2
-
L
3
phase of 52C
secondary side?
YES
YES
Compressor
overcurrent?
NO
Inspect at the unit side.
(1)
• Is the power supply voltage correct
(not too low)?
• Are the power supply wires appro-
priate (not too thin)?
• Is the overcurrent setting correct
(SW3 setting)?
• Is not it operated under overload?
Defective outdoor unit PCB
Replacement (Defective
CT input circuit)
• 3 Phase: Open phase at
L
1
or
L
2
phase
• Defective 52C
• 3 phase: Broken wire at
L
1
or
L
2
phase between 52C ~ CM or
TB1 ~ 52C
• During cooling: Is FM0
operating?
• At heating:
Is FM1
operating?
Is the service valve (gas side) opened
fully?
Is the filter clogged?
• Is it overcharged?
• Is the installation space of indoor
outdoor unit adequate?
• Is there any short circuit on the indoor/
outdoor unit?
1
Overcurrent of the compressor motor
Note (1) Measure and check the current value.
Confirm that the overcurrent setting by SW3 of outdoor
unit PCB is correct.
Outdoor unit
Red LED
Green LED
2 time flashes
Stays OFF
2
The wiring (secondary wiring of 52C) to the compressor is open.
Notes (1) When voltage is detected at 52C primary side
L2
or
L3
phase but not at the secondary side, check also 52C (bro-
ken coil, poor contact).
(2) When voltage is detected at 52C primary side
L2
or
L3
phase and there is no error at 52C (52C is energized if
TB
1
L2
or
L3
terminal and 52C coil secondary side con-
nector are short circuited), the outdoor unit PCB (defec-
tive X
01
circuit or X
01
).
3
The outdoor heat exchanger temperature is too high (70°C or over)
Are the heat
exchanger thermistor
Charateristisc
Normal?
YES
NO
NO
Heart exchanger thermistor
replacement
Is the unit
normalized
Defective outdoor unit
PCB Replacement
(Defective heat exchanger
thermistor input circuit)
Cooling, overload
operation?
Check the unit side closely
• Is outdoor fan motor operating?
• Is the outdoor unit shortcircuited?
• Is the installation space adequate?
• Is there too much refrigerant?
Operable
Error stop
60°C70°C
Outdoor unit heat exchanger temperature
(1)
(1)
Note (1) Outdoor unit heat exchanger thermistor detects
the state of cooling overload operation.
Outdoor unit
Red LED
Green LED
4 time flashes
Stays OFF
(b) Inspection method when there are fault lamps (outdoor unit LED)