Mitsubishi SKM32ZA Specifications Page 56

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172
Indoor fan motor error
[Defective fan motor,
defective PCB]
YES
YES
NO
NO
Is connector connection good?
Is voltage applied to fan motor?
(Between White - Red)
Defective fan motor
Correct connector
connection.
Defective indoor unit
PCB
Serial signal transmission abnormality
[Indoor/outdoor printed circuit board defect
Outdoor power source abnormality]
Drain abnormality
[Drain piping defective,
pump defect]
Are receiving lamps (LEDs 1 to 3) on?
Outdoor printed circuit board defect.
The outdoor printed circuit board is defective.
Does the voltage between 2 and 3
on the outdoor side oscillate
between 0 and 12V?
Does the voltage between 2 and 3
on the indoor side oscillate between
0 and 12V?
The indoor printed circuit board is defective.
The power supply and signal wire are defective.
YES
YES
YES
NO
(Flashing)
NO
NO
Has an overflow developed? Is the float switch operating?
Indoor printed circuit board
is defective.
Inspect float switch.
Repair and clean.
Indoor printed circuit board is defective.
Is the drain piping clogged or at the
wrong gradient?
Drain motor is defective. Inspect
wiring.
Is there output for drain motor driver?
YESYES
YES
YES
NONO
NO
NO
Note (1) Drain pump is an option.
Defrosting is performed for 10 minutes at approx. 30 minutes.
Defrosting is performed for 10 minutes at intervals of approx. 30 minutes.
Compressor stop (There is no inverter output.)
(4) Phenomenon observed after shortcircuit, wire breakage on thermistors, etc.
(a) Indoor unit
Phenomenon
Thermistor
Shortcircuit Broken wire
Cooling Release of continuous compressor operation command
Heating Continuous compressor operation command is not released.
Cooling System can be operated normally.
Heating High pressure control mode (Inverter stop command)
(b) Outdoor unit
Phenomenon
Thermistor
Shortcircuit Broken wire
Cooling System can be operated normally.
Heating Defrosting is not performed.
Cooling System can be operated normally.
Heating Defrosting is not operated.
All modes
Operation
mode
Room temperature
thermistor
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)
Heat exchanger
thermistor
Operation
mode
Heat exchanger
pipe thermistor
Outdoor temperature
thermistor
Discharge pipe
thermistor
Compressor overload protection is disabled.
(Can be operated.)
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