Mitsubishi Electric Mr.SLIM PSA-M-KA Series Installation Manual page 19

7. Test run
7.3. Error code
[Output pattern A] Errors detected by indoor unit
Check code
P1 Intake sensor error
P2 Pipe (TH2) sensor error
P9 Pipe (TH5) sensor error
E6, E7 Indoor/outdoor unit communication error
P6 Freezing/Overheating safeguard operation
EE Communication error between indoor and outdoor units
P8 Pipe temperature error
E4 Controller signal receiving error
FL Refrigerant leakage
FH Refrigerant sensor error
PL Refrigerant circuit abnormal
FB (Fb) Indoor unit control system error (memory error, etc.)
– – No corresponding
PB (Pb) Indoor unit fan motor error
[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/49C worked/insufficient refrigerant
Abnormal high pressure (63H worked)/Overheating safeguard operation
U1, Ud
U5 Abnormal temperature of heat sink
Outdoor unit fan safeguard stop
U8
Compressor overcurrent interruption/Abnormal of power module
U6
Abnormality of super heat due to low discharge temperature
U7
U9, UH Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit/
Current sensor error
FL Refrigerant leakage
FH Refrigerant sensor error
Others Other errors (Refer to the technical manual for the outdoor unit.)
• On controller
Check code displayed in the LCD.
• If the unit cannot be operated properly after the above test run has been performed, refer to the following table to remove the cause.
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 (LED 1, 2, 3) provided on the indoor controller, refer to the following table.
LED 1 (power for microcomputer)
LED 2 (power for remote controller)
LED 3 (communication between indoor and outdoor units)
Note:
If the unit is operated continuously during a test run, the unit stops after 2 hours.
Symptom
Symptom
Symptom
LED 1, 2 (PCB in outdoor unit)
For about 3 min- After LED 1, 2 are lighted, LED 2 is turned
utes following off, then only LED 1 is lighted. (Correct
power-on operation)
After about 3
Only LED 1 is lighted. → LED 1, 2 blink.
minutes has
expired following
power-on Only LED 1 is lighted. → LED 1 blinks twice,
LED 2 blinks once.
Indicates whether control power is supplied. Make sure that this LED is always lit.
Indicates whether power is supplied to the remote 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.
For details, check the LED
display of the outdoor controller
board.
Cause
• For about 3 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)
• Remote controller wire short
Remark
Remark
en
18