Mitsubishi Electric QUHZ-W40VA, Руководство по обслуживанию

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GHH15010
15
Abnormal point and
detection method
Case Check Code
Check LED
LED2
RED
LED1
GREEN
Judgment and action
2
times
Out
2
times
Out
Out
6
times
UP
2
times
EC
(1) Defective compressor lead
wire relay connector connection
a) Defective compressor relay
connector connection
b) Defective compressor terminal
connection
(2) Defective outdoor inverter
p.c. board
a) Defective Q821
b) Defective IC700
c) Defective overcurrent
detection circuit
(3) Defective LEV coil
a) Loose LEV coil
b) Loose connector [CN724]
c) LEV coil disconnection
(4) Defective LEV unit
a) LEV locked
b) Blocked with foreign matter
(5) Defective compressor
a) Compressor motor coil short
circuit, disconnection
b) Compressor locked
(6) Power waveform distortion,
noise
Overcurrent abnormality
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detected by secondary current
(1) Check the continuity of the
compressor and lead wires.
a) Connect compressor relay
connector*
b) Connect compressor terminal*
(*Before correcting the problem,
turn the circuit breaker off.)
(2) Replace outdoor inverter p.c.
board
(3) Check LEV coil
(See "9-4. HOW TO CHECK
THE PARTS.")
a) Install LEV coil
b) Connect connector (CN724)
c) Replace LEV coil
(4)-(5) Replace outdoor unit
(6) Check to see if the power
waveform is normal
(1) Compressor relay connector
disconnected
(2) Defective outdoor inverter
p.c. board
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mode* continued for 20 minutes
*The service mode is entered
when the outdoor unit is run with
the compressor relay connector
[CN61] disconnected. This
mode is used when measuring
the compressor drive voltage of
the outdoor inverter p.c. board.
Service mode end display
(1) Turn the earth leakage circuit
breaker of the Cylinder Unit to
"OFF" before connecting the
compressor relay connector of
the outdoor unit.
(2) Replace the outdoor inverter
p.c. board
(1) Defective outdoor inverter
p.c. board
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primary current detection sensor
detected continuously for 2
minutes
Abnormality of circuit to detect AC
current
(1) Replace the outdoor inverter
p.c. board
(1) Defective power transmission
line connection
(2) Defective outdoor inverter
p.c. board
(3) Defective cylinder unit control
board
(4) Noise
Start time exceeded
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receive communication detected
on outdoor unit microcomputer
(1) Correct power transmission
line connection
(2) Replace outdoor inverter p.c.
board
(3) Defective cylinder unit control
board
(4) Move power signal line away
from noise source