Mitsubishi SUZ-KA35VA Service Manual page 64

SUZ-KA25VA(H)R1.TH
Abnormal point
(Failure mode/protection)
N o n e ( N r o m a ) l
Outdoor power system
Discharge temperature
thermistor
Defrost thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
Ambient temperature
thermistor
Overcurrent
Compressor synchronous
abnormality (Compressor start-
up failure protection)
Discharge temperature
High pressure
Fin temperature/P.C. board
temperature
Outdoor fan motor
Nonvolatile memory data
Discharge temperature
DC voltage
Each phase current of
compressor
Overcurrent Compressor open-
phase
Stop valve (Closed valve)
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (12-3.).
OC322G
SUZ-KA35VA(H)R1.TH
LED indication
(Outdoor P.C. board)
—
Overcurrent protection stop is continuously
performed 3 times within 1 minute after
the compressor gets started.
—
1-time flash every Thermistor shorts or opens during compressor
2.5 seconds running.
3-time flash
2.5 seconds OFF
4-time flash
2.5 seconds OFF
2-time flash
2.5 seconds OFF
11-time flash Large current fl ows into intelligent power module. Reconnect compressor connector.
2.5 seconds OFF
12-time flash Waveform of compressor current is distorted.
2.5 seconds OFF
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.
—
Temperature indoor coil thermistor exceeds
70°C in HEAT mode.
Temperature defrost thermistor exceeds
—
70°C in COOL mode.
7-time flash Temperature of fi n temperature thermistor on
2.5 seconds OFF 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.
Outdoor fan has stopped 3 times in a row
within 30 seconds after outdoor fan start-up.
—
5-time flash Nonvolatile memory data cannot be read
2.5 seconds OFF properly.
Temperature of discharge temperature
thermistor has been 50°C or less for 20 minutes.
—
8-time flash DC voltage of inverter cannot be detected
2.5 seconds OFF normally.
9-time flash Each phase current of compressor cannot be
2.5 seconds OFF detected normally.
10-time flash Large current fl ows into intelligent power
2.5 seconds OFF module (IPM).
The open-phase operation of compressor
is detected.
The interphase short out occurs in the output
of the intelligent power module (IPM).
The compressor winding shorts out.
14-time flash Closed valve is detected by compressor current. Check stop valve
2.5 seconds OFF
SUZ-KA50VAR2.TH
Condition
—
64
Correspondence
—
• Reconnect connectors.
• Refer to 12-5. "How to check
inverter/compressor".
• Check stop valve.
• Refer to 12-5. "Check of
outdoor thermistors".
Defective outdoor thermistors
can be identified by checking
the blinking pattern of LED.
•
• Refer to 12-5. "How to check
inverter/compressor".
• Check stop valve.
• Reconnect compressor connector.
• Refer to 12-5. "How to check
inverter/compressor".
• Check refrigerant circuit and
refrigerant amount.
• Refer to 12-5. "Check of LEV".
• Check refrigerant circuit and
refrigerant amount.
• Check stop valve.
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 12-5. "Check of
outdoor fan motor".
• Refer to 12-5. "Check of
outdoor fan motor".
Refer to 11-5. "Check of inverter
P.C. board".
• Replace the inverter P.C. board.
• Refer to 12-5. "Check of LEV".
• Check refrigerant circuit and
refrigerant amount.
• Refer to 12-5. "How to check
inverter/compressor".
• Reconnect compressor connector.
• Refer to 12-5. "How to check
inverter/compressor".
•