Mitsubishi Electric Mr.SLIM PLA-SM71EA Service Manual page 21

Refer to the following tables for details on the check codes.
[Output pattern A]
Beeper sounds Beep
OPERATION
INDICATOR
lamp blinking
Off
pattern
Approx. 2.5 s
Self-check
starts
(Start signal
Number of blinks/beeps in pattern indicates the check
received)
code in the following table (i.e., n=5 for "P5")
[Output pattern B]
Beeper sounds Beep
OPERATION
INDICATOR
lamp blinking
Off
pattern
Approx. 2.5 s
Self-check
starts
(Start signal
received)
[Output pattern A] Errors detected by indoor unit
Wireless remote controller
Beeper sounds/OPERATION
INDICATOR lamp blinks
(Number of times)
1
2
3
4
5
6
7
8
9
10
11
12
14
—
—
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
Note: The supported check codes may vary depending on the connected outdoor unit.
Wireless remote controller
Beeper sounds/OPERATION
INDICATOR lamp blinks
(Number of times)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Notes:
1. If the beeper does not sound again after the initial 2 beeps to confirm the self-check start signal was received and
the OPERATION INDICATOR lamp does not come on, there are no error records.
2. If the beeper sounds 3 times continuously "beep, beep, beep (0.4 + 0.4 + 0.4 seconds)" after the initial 2 beeps to confirm
the self-check start signal was received, the specified refrigerant address is incorrect.
• On wireless remote controller
The continuous buzzer sounds from receiving section of indoor unit.
Blink of operation lamp
• On wired remote controller
Check code displayed in the LCD.
OCH683
Beep Beep Beep
1 st 2 nd 3 rd
On On On
0.5 s 0.5 s 0.5 s
Beep
1 st
On On
Approx. 3 s 0.5 s
Number of blinks/beeps in pattern indicates the check
code in the following table (i.e., n=5 for "U2")
Wired remote
controller
Check code
P1 Intake sensor error
P2 Pipe (TH2) sensor error
P9 Pipe (TH5) sensor error
E6, E7 Indoor/outdoor unit communication error
P4 Drain sensor error / Float switch connector open
P5 Drain overflow protection operation
PA Forced compressor error (due to water leakage abnormality)
Freeze (during cooling operation)/Overheat protection operation (during heating
P6
operation)
EE Communication error between indoor and outdoor unit
P8 Pipe temperature error
E4, E5 Communication error between wired remote controller and indoor unit
— —
Pb Indoor unit fan motor error
Fb Indoor unit control system error (memory error, etc.)
PL Refrigerant circuit abnormal
E0,E3 Remote controller transmission error
E1,E2 Remote controller control board error
Wired remote
controller
Check code
E9 Indoor/outdoor unit communication error
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
U1, Ud Abnormal high pressure (63H worked)/Overheat protection operation
U5 Abnormal temperature of heat sink
U8 Outdoor unit fan protection stop
U6 Compressor overcurrent interruption/Abnormal of power module
U7 Abnormality of super heat due to low discharge temperature
Abnormality such as overvoltage or voltage shortage and abnormal synchro-
U9, UH
nous signal to main circuit/Current sensor error
— —
— —
Others Other errors (Refer to the technical manual for the outdoor unit.)
Beep Beep Beep
n th 1 st 2 nd
· · · Repeated
Off On On
On
Approx. 2.5 s 0.5 s 0.5 s
0.5 s
Number of blinks/beeps in pattern indicates
the check code in the following table
Beep Beep Beep
2 nd 3 rd n th
On On On Off
0.5 s 0.5 s 0.5 s Approx. 2.5 s
Symptom
Symptom
21 21
Beep Beep
1 st
2 nd
· · · Repeated
On On On
Approx. 3 s 0.5 s 0.5 s
Number of blinks/beeps in pattern indicates
the check code in the following table
Remark
Remark
For details, check the LED
display of the outdoor
controller board.
Continued to the next page