Service manual

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32
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15
[Power transistor thermistor faulty.] (Only case of 151~251 type)
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
1 time flash
Outdoor unit
Temperature [T] (°C)
T
<
80°C
T
>
80°C
100
50
0
10
5
0
05020 80 100 120
Is the
power transistor thermistor
connector connection
OK?
NO
YES
Repair
Are the
power transistor
thermistor characteristics
OK, is there no
broken wire?
Defective power transistor
thermistor Replacement
NO
YES
Defective outdoor unit control
PCB Replacement (Defective
power transistor thermistor input
circuit)
Temperature-resistance
characteristics of power
transistor thermistor (Th
O-D)
Thermistor resistance
(kΩ)
[T
<
80°C]
Thermistor resistance
(kΩ)
[T
>
80°C]
Error display :
e56
● Display conditions
If the temperature sensed by the thermistor is –10ºC or lower con-
tinuously for 5 seconds between 10 minutes and 10 minutes 20
seconds after the compressor goes ON, the compressor stops. Af-
ter a 3 minute delay, the compressor restarts. If this state is de-
tected 3 times in 40 minutes.
16
[Insufficient refrigerant volume.]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
Error display :
e57
Is the service valve
opened fully?
Are the
connections of the connectors
to the indoor heat exchanger and return
air thermistor OK?
Are the
characteristics of the indoor
heat exchanger and return air
thermistor OK?
Is the low pressure during
operation normal?
Fully opened.
NO
YES
NO
YES
YES
NO
YES
Temperature (°C)
15
10
5
010 304020 50
5kΩ at 25°C
Return air thermistor (ThI-A)
Indoor unit heat exchanger thermistor
(Th
I-R1, R2)
Resistance temperature characterisics
Resistance
(kΩ)
NO
Indoor control PCB faulty
Replace
(The indoor heat exchanger
and return air thermistor input
circuits are faulty.)
Normal
Charge with refrigerant.
Indoor heat exchanger and
return air thermistor faulty
Replace
● Display conditions
If insufficient refrigerant protection (See page 92) is implemented
3 times within 30 minutes.
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.