Mitsubishi Electric Mr. Slim PSY-SP KA Series Installation Manual page 10

7. Test run
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Check code
E9 Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
UP Compressor overcurrent interruption
U3, U4 Open/short of outdoor unit thermistors
UF Compressor overcurrent interruption (When compressor locked)
U2 Abnormal high discharging temperature/insufficient refrigerant
Abnormal high pressure (63H worked)/Overheating safeguard operation
U1, Ud
Abnormal temperature of heat sink
U5
Outdoor unit fan safeguard stop
U8
Compressor overcurrent interruption/Abnormal of power module
U6
U7 Abnormality of super heat due to low discharge temperature
U9, UH Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit/
Current sensor error
– –
– –
Others Other errors (Refer to the technical manual for the outdoor unit.)
• On wired controller
Check code displayed in the LCD.
• If the unit cannot be operated properly after the test run has been performed, refer to the following table to remove the cause.
Wired controller
PLEASE WAIT
PLEASE WAIT → Error code
Display messages do not appear even
when operation switch is turned ON
(operation lamp does not light up).
Note:
Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)
For description of each LED (LED1, 2, 3) provided on the indoor controller, refer to the following table.
LED 1 (power for microcomputer)
LED 2 (power for controller)
LED 3 (communication between indoor and outdoor units)
10
Symptom
LED 1, 2 (PCB in outdoor unit)
For about 2 min-
After LED 1, 2 are lit, LED 2 is turned off,
utes following
then only LED 1 is lit. (Correct operation)
power-on
After about 2
Only LED 1 is lit. → LED 1, 2 blink.
minutes has
expired following
Only LED 1 is lit. → LED 1 blinks twice, LED
power-on
2 blinks once.
Indicates whether control power is supplied. Make sure that this LED is always lit.
Indicates whether power is supplied to the controller. This LED lights only in the case of the indoor
unit which is connected to the outdoor unit refrigerant address "0".
Indicates state of communication between the indoor and outdoor units. Make sure that this LED is
always blinking.
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Symptom
• For about 2 minutes following power-on, operation of the
controller is not possible due to system start-up. (Correct
operation)
• Connector for the outdoor unit's protection device is not
connected.
• Reverse or open phase wiring for the outdoor unit's power
terminal block (L1, L2, L3)
• Incorrect wiring between indoor and outdoor units (incorrect
polarity of S1, S2, S3)
• Controller wire short
Remark
For details, check the LED
display of the outdoor controller
board.
Cause