Outdoor Fan Motor Error; Rotor Lock - Mitsubishi SRK63ZEA-S1 Technical Manual

Outdoor fan motor error

Is connector connection good?
YES
* Disconnect the fan motor
connector, then investigate
t h e D C f a n m o t o r a n d
outdoor unit circuit board
separately.
Is the output of the outdoor unit's
printed circuit board normal?
YES
Normal

Rotor lock

(8) Phenomenon observed after shortcircuit, wire breakage on sensor
(a) Indoor unit
Operation
Sensor
mode
Cooling
Room temperature
sensor
Heating
Cooling
Heat exchanger
sensor
Heating
Cooling
Humidity Sensor
Heating
1 Humidity sensor operation
Failure mode
1 Disconnected wire
2 Disconnected wire
12 Disconnected wire
1 and 2 are short
circuited
Remark: Do not perform a continuity check of the humidity sensor with a tester. If DC current is applied, it
could damage the sensor.
NO
Correct connector connection
Is DC fan motor resistance value good?
NO
Replace outdoor PCB
Is output voltage applied to all 3
phases of power transistor?
YES
Inspect compressor.
Shortcircuit
Release of continuous compressor operation command
Continuous compressor operation command is not released.
Compressor stop.
(Abnormality of outdoor unit)
High pressure control mode
1 in the table below.
Normal system operation is possible.
Control input circuit reading
Humidity reading is 0%
Humidity reading is 0%
Humidity reading is 0%
Humidity reading is 100%
NO
YES
Replace outdoor fan motor
NO
Defective inverter
¡ Check compressor wiring visually.
¡ Check insulation resistance. (1 MΩ or over)
¡ Check coil wire resistance. (Few Ω)
Phenomenon
Continuous compressor operation command is not released.
Release of continuous compressor operation command
Continuous compressor operation command is not released.
(Anti-frosting)
Hot keep (Indoor fan stop)
1 in the table below.
Air conditioning system operation
Operates in the Dry region
Operates in the Dry region
Operates in the Dry region
Operates in the Cooling region.
61
- -
[Defective fan motor, connector
poor connection, defective PCB]
[Compressor defect, outdoor
unit circuit defect]
If check results are normal,
compressor is locked.
Broken wire
Humidity sensor
element
Connector
(CnF)
Humidity sensor assembly