Service manual

27
Abnormal point
(Failure mode / protection)
LED indication
(Outdoor P.C. board)
Condition Correspondence
None (Normal)
—— —
Outdoor power system
—
Overcurrent protection stop is continuously
performed 3 times within 1 minute after the
compressor gets started.
Reconnect connectors.
Refer to 11-5. a"How to check inverter/
compressor".
Check stop valve.
•
•
•
Discharge temperature thermistor 1-time fl ash every 2.5
seconds
Thermistor shorts or opens during compressor
running.
Refer to 11-5.g"Check of outdoor thermistors".
Defective outdoor thermistors can be identifi ed
by checking the blinking pattern of LED.
•
Defrost thermistor
Fin temperature thermistor 3-time fl ash
2.5 seconds OFF
P.C. board temperature thermistor 4-time fl ash
2.5 seconds OFF
Ambient temperature thermistor 2-time fl ash
2.5 seconds OFF
Outdoor heat exchanger temperature
thermistor
—
Overcurrent 11-time fl ash
2.5 seconds OFF
Large current fl ows into intelligent power
module.
Reconnect compressor connector.
Refer to 11-5.a"How to check inverter/
compressor".
Check stop valve.
•
•
•
Compressor synchronous abnormality
(Compressor start-up failure protection)
12-time fl ash
2.5 seconds OFF
Waveform of compressor current is distorted. Reconnect compressor connector.
Refer to 11-5.a"How to check inverter/
compressor".
•
•
Discharge temperature
—
Temperature of discharge temperature
thermistor exceeds 116°C, compressor stops.
Compressor can restart if discharge
temperature thermistor reads 100°C or less 3
minutes later.
Check refrigerant circuit and refrigerant amount.
Refer to 11-5.k"Check of LEV".
•
•
High pressure
—
Temperature indoor coil thermistor exceeds
70°C in HEAT mode. Temperature defrost
thermistor exceeds 70°C in COOL mode.
Check refrigerant circuit and refrigerant amount.
Check stop valve.
•
•
Fin temperature/ P.C. board
temperature
7-time fl ash
2.5 seconds OFF
Temperature of fi n temperature thermistor
on the inverter P.C. board exceeds 75 ~ 80°
C, or temperature of P.C. board temperature
thermistor on the inverter P.C. board exceeds
70 ~ 75°C.
Check around outdoor unit.
Check outdoor unit air passage.
Refer to 11-5.i"Check of outdoor fan motor".
•
•
•
Outdoor fan motor
—
Outdoor fan has stopped 3 times in a row
within 30 seconds after outdoor fan start-up.
Refer to 11-5.i"Check of outdoor fan motor".
Refer to 11-5.l"Check of inverter P.C. board".
•
Nonvolatile memory data 5-time fl ash
2.5 seconds OFF
Nonvolatile memory data cannot be read
properly.
Replace the inverter P.C. board. •
Power module 6-time fl ash
2.5 seconds OFF
The interphase short circuit occurs in the
output of the intelligent power module (IPM).
The compressor winding shorts circuit.
Refer to 11-5. a"How to check inverter/
compressor".
•
Discharge temperature
—
Temperature of discharge temperature
thermistor has been 50°C or less for 20
minutes.
Refer to 11-5.k"Check of LEV".
Check refrigerant circuit and refrigerant amount.
•
•
DC voltage 8-time fl ash
2.5 seconds OFF
DC voltage of inverter cannot be detected
normally.
Refer to 11-5.a"How to check inverter/
compressor".
•
Each phase current of compressor 9-time fl ash
2.5 seconds OFF
Each phase current of compressor cannot be
detected normally.
Overcurrent Compressor open-phase 10-time fl ash
2.5 seconds OFF
Large current fl ows into intelligent power
module (IPM).
The open-phase operation of compressor is
detected.
The interphase short circuit occurs in the
output of the intelligent power module (IPM).
The compressor winding shorts circuit.
Reconnect compressor connector.
Refer to 11-5. a"How to check inverter/
compressor".
•
•
Stop valve (Closed valve) 14-time fl ash
2.5 seconds OFF
Closed valve is detected by compressor
current.
Check stop valve •
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3).
SUZ-KA71VA2.TH
OCH472A