Mitsubishi Electric MSZ-FA25VA Service Manual page 16

Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy
4. Indoor unit failure mode table
NOTE: Blinking patterns of this mode differs from the ones of Troubleshooting check table(9-4.).
POWER lamp
Not lighted
Room temperature
1-time flash
thermistor
every 0.5-second
2-time flash
Indoor coil thermistor
2.5-second OFF
3-time flash
Serial signal error
2.5-second OFF
11-time flash
Indoor fan motor
2.5-second OFF
12-time flash
Indoor control system
2.5-second OFF
5. PLASMA DEODORIZING/PLASMA AIR PURIFYING power failure mode table
POWER lamp
PLASMA DEODORIZING/
1-time flash
PLASMA AIR PURIFYING
power control
Spark discharge
2-time flash
Abnormal electric
3-time flash
discharge error 1
Abnormal electric
4-time flash
discharge error 2
PLASMA DEODORIZING/
5-time flash
PLASMA AIR PURIFYING
power
w As soon as an error is detected, PLASMA DEODORIZING power or PLASMA AIR PURIFYING power goes OFF,
therefore measuring instrument which records the voltage wave is required in order to perform the above men-
tioned voltage measurement.
Abnormal point
(Failure mode)
Normal
When the room temperature thermistor short
or open circuit is detected every 8
seconds during operation.
When the indoor coil thermistor short or open
circuit is detected every 8 seconds during
operation.
When the serial signal from outdoor unit is
not received for a maximum of 6 minutes.
When the rotational frequency feedback
signal is not emit during 12-second the
indoor fan operation.
When it cannot properly read data in the
nonvolatile memory of the indoor electronic
control P.C. board.
Abnormal point
(Failure mode)
When PLASMA DEODORIZING/PLASMA
AIR PURIFYING power cannot be turned
OFF.
When the voltage between CN1 1(+)
and 2(GND) on the PLASMA POWER P.C.
board (PLASMA DEODORIZING or PLASMA
AIR PURIFYING) falls below 1.6V(spark
discharge judgment voltage).
When the voltage between CN1 1(+)
and 2(GND) on the PLASMA POWER P.C.
board (PLASMA DEODORIZING or PLASMA
AIR PURIFYING) falls 0.9V below the normal
range voltage.
When the voltage between CN1 1(+)
and 2(GND) on the PLASMA POWER P.C.
board (PLASMA DEODORIZING or PLASMA
AIR PURIFYING) falls significantly.
(0.4V / 0.5ms)
When the voltage between CN1 1(+)
and 2(GND) on the PLASMA POWER P.C.
board (PLASMA DEODORIZING or PLASMA
AIR PURIFYING) rises above the normal
voltage value (3V).
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Detection method
–
Refer to the characteristics of the room
temperature thermistor (9-7.).
Refer to the characteristic of the main
indoor coil thermistor, the sub indoor coil
thermistor (9-7.).
Refer to 9-6.D "How to check miswiring
and serial signal error".
Refer to 9-6.A "Check of indoor fan
motor".
Replace the indoor electronic control
P.C. board.
Detection method
Replace the indoor electronic control P.C.
board.
Refer to 9-6.F"Check of PLASMA
DEODORIZING power" or 9-6.G"Check
of PLASMA AIR PURIFYING power".
Refer to 9-6.F"Check of PLASMA
DEODORIZING power" or 9-6.G"Check
of PLASMA AIR PURIFYING power".
Refer to 9-6.F"Check of PLASMA
DEODORIZING power" or 9-6.G"Check
of PLASMA AIR PURIFYING power".
Refer to 9-6.F"Check of PLASMA
DEODORIZING power" or 9-6.G"Check
of PLASMA AIR PURIFYING power".
16
Check point
–
Check point