Suz-Ka50Va3.Th - Mitsubishi Electric SUZ-KA25VA3 Technical & Service Manual

11-2-4. Outdoor unit failure mode table
SUZ-KA25VA3.TH
Check code
Abnormal point
(Wired remote
(Failure mode/protection)
contoller)
None (Normal)
—
Indoor/outdoor
communication, receiving
error
—
Indoor/outdoor
communication, receiving
error
Outdoor power system
UP
Discharge temperature
U3
thermistor
Defrost thermistor
Fin temperature thermistor
P.C. board temperature
thermistor
U4
Ambient temperature
thermistor
Outdoor heat exchanger
temperature thermistor
Overcurrent
UF
Compressor synchronous
abnormality (Compressor
start-up failure protection)
Discharge temperature
U2
High pressure
UD
Fin temperature
U5
P.C. board temperature
UB
Outdoor fan motor
U8
Nonvolatile memory data
FC
Power module
U6
Discharge temperature
U7
DC voltage
UJ
Each phase current of
UH
compressor
Stop valve (Closed valve)
UE
NOTE: Blinking patterns of this mode differ from the ones of Troubleshooting check table (11-3.).
OCH530
SUZ-KA35VA3.TH
LED indication
(Outdoor P.C. board)
—
Any signals from the inverter P.C.
— board cannot be received normally for
3 minutes.
Although the inverter P.C. board sends
— signal "0", signal "1" has been received
30 consecutive times.
Overcurrent protection cut-out
operates 3 consecutive times within
1 minute after the compressor gets
—
started.
1-time flash every Thermistor shorts or opens during
2.5 seconds compressor 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 flows into intelligent
2.5 seconds OFF power module.
12-time flash Waveform of compressor current is
2.5 seconds OFF distorted.
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 fin temperature
2.5 seconds OFF thermistor on the inverter P.C. board
exceeds 75 ~ 86°C.
Temperature of P.C. board temperature
thermistor on the inverter P.C. board
exceeds 72 ~ 85°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
2.5 seconds OFF read properly.
6-time flash The interface short circuit occurs in the
2.5 seconds OFF output of the intelligent power module
(IC700).
The compressor winding shorts circuit.
Temperature of discharge temperature
thermistor has been 50°C or less for
— 20 minutes.
8-time flash DC voltage of inverter cannot be
2.5 seconds OFF detected normally.
9-time flash Each phase current of compressor
2.5 seconds OFF cannot be detected normally.
14-time flash Closed valve is detected by
2.5 seconds OFF compressor current.

SUZ-KA50VA3.TH

C o n d t i o i n
—
24
Indoor/outdoor
unit failure
R e m e d y
mode recall
function
— —
•Refer to 11-5. How
to check miswiring and
○
serial signal error.
•Refer to 11-5. How
to check miswiring and
serial signal error.
• Reconnect
connectors.
○
• Refer to 11-5. "How
to check inverter/
compressor".
• Check stop valve.
• Refer to 11-5.
"Check of outdoor
thermistors".
Defective outdoor
thermistors can be
identified by checking
the blinking pattern of ○
LED.
• Reconnect
compressor connector.
• Refer to 11-5. "How
—
to check inverter/
compressor".
• Check stop valve.
• Reconnect
compressor connector.
• Refer to 11-5. "How
—
to check inverter/
compressor".
• Check refrigerant
circuit and refrigerant
amount.
—
• Refer to 11-5. "Check
of LEV".
• Check refrigerant
circuit and refrigerant
amount.
—
• Check stop valve.
• Check around outdoor
unit.
• Check outdoor unit air
passage.
—
• Refer to 11-5. "Check
of outdoor fan motor".
• Refer to 11-5. "Check
of outdoor fan motor".
—
Refer to 11-5. "Check
of inverter P.C. board".
• Replace the inverter
P.C. board.
○
• Refer to 11-5. "How
to check inverter/
compressor".
• Refer to 11-5. "Check
of LEV".
• Check refrigerant —
circuit and refrigerant
amount.
• Refer to 11-5. "How
to check inverter/
compressor".
—
○
• Check stop valve
Outdoor unit
failure mode
recall function
—
○
○
○
○
○
○
○
○
○
○
○
○
○