279
FDTN-H
Outdoor unit LED
Green
Keeps flashing
Stays OFF
Stays OFF
Stays OFF
Stays OFF
1 time flash
1 time flash
1 time flash
2 time flashes
3 time flashes
4 time flashes
5 time flashes
1 time flash
2 time flashes
3 time flashes
Red
Stays OFF
Failure at:
Contents of the failure
Installation or
operation status
Installation or
operation status
Installation or
operation status
Discharge gas
thermistor
Outdoor heat
exchanger thermistor
Outdoor temperature
thermistor
Discharge gas
thermistor
Outdoor heat
exchanger thermistor
CM wiring
Power wiring
• Over current of the compressor motor.
• Open phase at L2 phase (secondary wiring of 52C) of compressor.
• Defective outdoor unit PCB.
Stays OFF
1 time flash
• The outdoor power wiring is in reversed phase.
• Open phase at L3 phase (primary side).
• Incorrect set-up of outdoor unit PCB.
Normal/Power is supplied.
• The outdoor heat exchanger temperature is too high [70
°
C or over].
• Failure with the outdoor heat exchanger thermistor.
• The discharge gas temperature is too high.
• Failure with the discharge gas thermistor.
• Failure or open circuit with the outdoor heat exchanger thermistor or
imperfect connection of the connector.
• Failure or open circuit with the outdoor temperature thermistor or
imperfect connection of the connector.
• Failure with the discharge gas thermistor or imperfect connection of the
connector.
• The wiring (secondary wiring of 52C) to the compressor is open.
(4)
Outdoor unit side (FDC308, 408, 508 model only)
Failure mode on the outdoor unit is indicated by flashing both Green LED (LED-G) and Red LED (LED-R) on the printed circuit board.
Check Indicator Table
Parts No.
PCA505A046ZN
Model
1 phase model
Parts No.
PCA505A046ZS
Model
3 phase model
b)
Set the overcurrent value using the overcurrent setting switch (SW3) for CM. Refer to the following table at the
setting.
• Table of switch (SW3) setting
Model
FDC508HES3
Setting value (A)
15
Table of switch
setting
Make ON/OFF
setting for each
switch No.
( : ON, : OFF)
6
5
4
3
2
1
ON
FDC408HES3
12
6
5
4
3
2
1
ON
FDC308HES3
9
6
5
4
3
2
1
ON
FDC308HEN3
23
6
5
4
3
2
1
ON
“Check Indicator” is resetted when power supply is turned off once and the failure is fixed.
(a)
Procedure for diagnosing trouble for outdoor unit
When diagnosing trouble for the outdoor unit, check the flashing and turns of the inspection indicator lamp (red LED) and
fault indicator lamp (green LED) to obtain a general concept of the nature of the problem. Then inspect and perform repair.
1)
Unit replacement parts related to printed circuit board for outdoor unit.
Micro-computer for outdoor unit, microcomputer, printed circuit board, thermistor (heat exchanger, discharge piping
and outdoor air), fuses and transformer.
2)
Summary of replacement for micro-computer for outdoor unit
a)
Check the following part number
Summary of Contents for FDT208HEN-S
Page 74: ...MEMO...
