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4
[Open phase at L3 phase of 52C secondary side] (Only case of 301~601 type)
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
AAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAA
AAA
AAA
52C
secondary side L3 phase
open?
Repair
YES
NO
The outdoor unit control PCB is faulty.
(The CT circuit is faulty) Replace
(1)
(2)
If the unit is operated with the service valve closed, 49C (internal ther-
mostat) operates. E34 may also be displayed. Check the service valve.
Notes (1) Also check if there is voltage at the L3 phase on the 52C primary
side, but no voltage on the secondary side (coil wire disconnec-
tion or faulty contacts).
(2) If there is voltage at the L3 phase on the 52C primary side and it
is not abnormal, the outdoor unit control PCB is faulty.
5
[Cooling overload operation]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
Are the
characteristics of the
outdoor heat exchanger thermistor
normal?
NO
NO
Replace the outdoor heat
exchanger thermistor.
Is the unit normal?
Check the unit side.
Error stop
Return
Outdoor air temp. (ºC)
YES
The outdoor control PCB
is faulty. Replace
Is there cooling overload
operation?
Is high pressure control
normal?
Abnormal temperature detection
Is it (the actual measurement) correct?
NO
A
58.5
53.5
48.5
58
B
53.5
48.5
43.5
53
48 65
(1)
Abnormal Temperature Detection
Compressor speed
(rps)
Indoor heat exchanger
temprature (˚C)
less than 88
88 to less than 108
108 or higher
65 or more
60 or more
55 or more
• Is there a short circuit in the outdoor unit?
• Is the installation space proper?
• Is the refrigerant level too high?
• Is the heat exchanger dirty or clogged?
(1)
The compressor’s speed drops when all the following conditions are met
(151~251). In the case of the 301~601, expansion valve control is performed.
1
Outdoor heat exchanger temperature: A˚C or higher
2
Outdoor air temperature: 41ºC or higher
3
The outdoor unit’s fan runs at 7 speed (UHi)
(1)
continuously for
30 seconds or longer.
(2) Control is cancelled when the temperature drops to BºC or lower.
Model
151~251 type
Note (1) Values in ( ) show for the case of the 301~601 models.
Compressor
speed
(rps)
less than 88
88 to less than 108
108 or higher
301~601 type
Item
Note (1) In the case of the 151 ~
251, the abnormal stop
temperature differs
depending on the
compressor’s speed.
Temperature (°C)
15
10
5
010 304020 50
5kΩ at 25°C
Outdoor unit heat exchanger
themistor (Tho-R)
Resistancetemperature characteristics
Resistance
(kΩ)
Error display :
e34
Error display :
e35
● Display Conditions
If the outdoor heat
exchanger temperature
becomes 65ºC 5 times
within 60 minutes,
including while the
compressor is stopped,
or if it continues at that
temperature for 10
minutes or longer.
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.