-
153
-
15
[Defective under-doom thermistor] (Only case of FDCA801, 1001 type)
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
Error display :
e55
Repair
Temperature (°C)
15
10
5
010 304020 50
5kΩ at 25°C
Under-doom thermistor (Th
O
-H)
Resistance temperature characterisics
Resistance
(kΩ)
NO NO
Is the
under-doom
thermistor connector
connection OK?
Are the under-doom
thermistor characteristks OK,
is there no broken wire?
YES YES
Defective under-doom
thermistor Replacement
Defective outdoor unit control
PCB Replacement (Defective
under-doom
thermistor input circuit)
● Display conditions
If the temperature sensed by the thermistor is –50ºC or lower continuously for 5 seconds between
10 minutes and 10 minutes 20 seconds after the compressor goes ON, the compressor stops. After
a 3 minute delay, the compressor restarts. If this state is detected 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 81) is implemented
3 times within 30 minutes.
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