Trouble Judgement Criteria Of Main Parts; Operation Indicator - Mitsubishi Electric MLZ-KP25VF Service Manual

OPERATION INDICATOR

Abnormal
No.
Operation indicator lamp
point
Right lamp flash
MXZ type
Operation
1
mode
2.5-second OFF
setting
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.

11-5. TROUBLE JUDGEMENT CRITERIA OF MAIN PARTS

MLZ-KP25VF MLZ-KP35VF MLZ-KP50VF
Part name
Room temperature
thermistor (RT11)
Indoor coil thermistor
RT13 (SUB))
Indoor fan motor
Float sensor (FS)
Drain pump (DP)
Horizontal vane
motor (MV1)
Vertical vane
OBH801
Lit
· Flashing of OPERATION INDICATOR lamp (right-hand side lamp) indicates
abnormality.
Blinking
· OPERATION INDICATOR lamp (left-hand side lamp) is lighted.
Not lit
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
.
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.
Color of the lead wire
BLUE-BLUE (Drain pump side)
RED-RED (Control P.C. board side)
Measure the resistance between the terminals with a tester.
Color of the lead wire
RED-YLW
Measure the resistance between the terminals with a tester.
Color of the lead wire
RED-YLW
Condition
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
Normal
Normal
30
Remedy
Unify the operation mode.
Refer to outdoor unit
service manual.
Figure
YLW
ROTOR
YLW
RED
YLW YLW