Mitsubishi SUZ-KA35VA Service Manual page 61

12-2-4. Outdoor unit failure mode table
SUZ-KA25VA(H) SUZ-KA35VA(H) (Except for SUZ-KA25/35VA(H)R1.TH)
Abnormal point
LED indication
(Failure mode)
(Outdoor unit)
1-time flash every Outdoor thermistors
2.5 seconds
2-time flash
2.5 seconds OFF
3-time flash
2.5 seconds OFF
4-time flash
2.5 seconds OFF
5-time flash Outdoor control
2.5 seconds OFF system
7-time flash Fin temperature/P.C.
2.5 seconds OFF board temperature
overheat
8-time flash Converter control
2.5 seconds OFF system
9-time flash
2.5 seconds OFF
10-time flash Overcurrent protection
2.5 seconds OFF
11-time flash Overcurrent protection
2.5 seconds OFF
12-time flash
2.5 seconds OFF
Lighting Refrigerant system
High pressure
protection
Low discharge
temperature
Outdoor fan
Outdoor power
system ( )
Operation indicator lamp of the indoor unit (only the wireless remote controller use model) blinks twice.
Refer to 12-2-1. 3 and 12-2-3. [Outdoor pattern B].
OC322G
Details of abnormal
Discharge temperature
Defrost thermistor
Ambient temperature thermistor
Fin temperature thermistor
P.C. board temperature thermistor
Nonvolatile memory data
Fin
temperature/P.C. board
temperature overheat
protection
DC voltage
Compressor each phase
current
Compressor open-phase
protection
Overcurrent protection
Compressor synchronous
abnormality
(Compressor start-up failure
protection)
Discharge temperature
overheat protection
High pressure protection
(Overheat protection)
Low discharge temperature
protection
Outdoor fan protection
Outdoor power system
61
Detection method
When thermistors short or open during
compressor running.
When nonvolatile memory data
cannot be read properly, unit stops.
When fin temperature exceeds 83
(SUZ-KA25VA(H))/82 (SUZ-KA35VA(H)),
or P.C. board temperature exceeds 85
(SUZ-KA25VA(H))/81 (SUZ-KA35VA(H)).
When DC voltage of inverter cannot
be detected normally.
When compressor each phase current
cannot be detected normally.
When 14A (SUZ-KA25VA(H))/24A
(SUZ-KA35VA(H)) current flow into
intelligent power module (IPM).
When the open-phase protection of
compressor is detected.
When the interphase short out occurs
in the output of the intelligent power
module (IPM).
When the compressor winding
shorts out.
When 14A (SUZ-KA25VA(H))/24A (SUZ-
KA35VA(H)) current flow into intelligent
power module (IPM).
When waveform of compressor
current is distorted.
When discharge temperature
exceeds 116 .
When the indoor coil thermistor (TH5)
exceeds 70 in HEAT mode.
When the defrost thermistor exceeds
70 in COOL mode.
When discharge temperature has
been 50 or less for 20 minutes.
When outdoor fan has stopped within
30 seconds 3 times in a row after
outdoor fan start-up, unit stops.
When it consecutively occurs 3 times
that the compressor stops for
overcurrent protection or start-up
failure protection within 1 minute
after start-up.
Check point
•Check the outdoor thermistors
Defective outdoor thermistors can
be identified by checking the blinking
pattern of LED.
•Replace the inverter P.C. board.
•Check around outdoor unit.
•Check outdoor unit air passage.
•Check the outdoor fan motor.
•Check the inverter/compressor.
•Reconnect compressor connector.
•Check the inverter/compressor.
•Reconnect compressor connector.
•Check the inverter/compressor.
•Check the stop valve.
•Reconnect compressor connector.
•Check the inverter/compressor.
•Check the refrigerant circuit and
refrigerant amount.
•Check the LEV.
•Check the outdoor thermistors.
•Check refrigerant circuit and
refrigerant amount.
•Check the stop valve.
•Check the refrigerant circuit and
refrigerant amount.
•Check the LEV.
•Check the outdoor fan motor.
•Check the inverter P.C. board.
•Reconnect compressor connector.
•Check the inverter/compressor.
•Check the stop valve.