Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 365

OPERATION INDICATOR
Abnormal
No. Operation indicator lamp
point
Right lamp flash
MXZ type
Operation
1
mode
setting 2.5-second OFF
NOTE : When the indoor unit has started operation and the above failures are detected (the first detection after the power
ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR lamp
flashing.
9-5. Trouble judgement criteria of main parts
MLZ-KA25VA MLZ-KA35VA MLZ-KA50VA
Part name
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12,RT14,RT15(MAIN),
RT13(SUB))
Indoor fan motor
Float sensor (FS)
Drain pump (DP)
Horizontal vane
motor (MV1)
Vertical vane
motor (MV2)
Lighted
· Flashing of OPERATION INDICATOR lamp (right-hand side lamp) indicates
abnormality.
Blinking
· OPERATION INDICATOR lamp (left-hand side lamp) is lighted.
Not lighted
Symptom
Outdoor unit
operates but
indoor unit
does not
operate.
Check method and criteria
Measure the resistance with a tester. (Part temperature 10˚C ~ 30˚C)
Normal
8 k ~ 20 k
Check 9-6. A .
Disconnect connector and check with a tester.
Check open or short according to the float position.
Float sensor
Float
position
Float
Normal Short
Measure the resistance between the terminals with a tester.
(Part temperature 10°C ~ 30°C)
Color of the lead wire
GRAY-GRAY
Measure the resistance between the terminals with a tester.
(Part temperature 20°C ~ 30°C)
Color of the lead wire
BRN-other one
Each phase 380
Measure the resistance between the terminals with a tester.
(Part temperature 20°C ~ 30°C)
Color of the lead wire
BRN-other one Each phase 300
Check point
When the operation mode of the each indoor
unit is differently set to COOL(includes DRY)
and HEAT at the same time, the operation
mode of the indoor unit that has operated at
first has the priority.
Float sensor
Float
Open
Normal
520 ~ 620
Normal
Normal
Resolución de averías
Countermeasure
• Unify the operation mode.
Refer to outdoor unit
service manual.
Figure
RED
ROTOR
YLW
BRN
ORN GRN
365