Mitsubishi Electric MSZ-HR25VFK-ER1 Service Manual page 29

OPERATION INDICATOR
HR25/35/42/50 HR60/71
Abnormal
No. Operation indicator lamp
point
Left/Upper lamp lights and right lamp blinks.
*1
MXZ type
Operation
1
2.5-second OFF
mode
setting
*1 Left lamp: HR25/35/42/50
Upper lamp: HR60/71
10-5. TROUBLESHOOTING CRITERION OF MAIN PARTS
Part name
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor (MF)
Vane motor (MV)
*SKY = SKY BLUE
OBH822F
Lit
Blinking
Not lit
Symptom
Outdoor unit
operates but
indoor unit does
not operate.
Check method and criterion
Measure the resistance with a multimeter.
Refer to 10-7. "Test point diagram and voltage", "Indoor electronic control
P.C. board", for the chart of thermistor.
Check 10-6. "Check of indoor fan motor".
Measure the resistance between the terminals with a multimeter.
(Temperature: 10 - 30°C)
Color of the lead wire
HR25/35/42/50
RED-SKY
HR60/71
RED-BLU
Condition
The operation mode of the each indoor unit is
differently set to COOL (includes DRY, FAN)
and HEAT at the same time, the operation
mode of the indoor unit that has operated at
first has the priority.
Normal
*
262 - 328 Ω
29
Remedy
• Unify the operation mode.
Refer to outdoor unit service
manual.
Figure
<HR25/35/42/50>
SKY
ROTOR
SKY
RED
SKY SKY
<HR60/71>
BLU
ROTOR
BLU
RED
BLU BLU