Mitsubishi Electric Mr.SLIM PLA Series Service Manual page 19

• Refer to the following tables for details on the check codes.
[Output pattern A]
Beeper sounds Beep
OPERATION
INDICATOR
lamp flash
Off
pattern
Approx. 2.5 sec.
Self-check
starts
(Start signal
Number of flashes/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 flash
Off
pattern
Approx. 2.5 sec.
Self-check
starts
(Start signal
received)
[Output pattern A] Errors detected by indoor unit
Wireless remote controller
Beeper sounds/OPERATION
INDICATOR lamp flashes
(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.)
Wireless remote controller
Beeper sounds/OPERATION
INDICATOR lamp flashes
(Number of times)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
*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 sec.)" 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.
OCH529
Beep Beep Beep Beep
1 st 2 nd 3 rd n th
On On On
On
0.5 sec. 0.5 sec. 0.5 sec.
0.5 sec.
Beep Beep Beep
1 st 2 nd
On On On
Approx. 3 sec. 0.5 sec. 0.5 sec.
Number of flashes/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
Pipe (TH2) sensor error
P2
Pipe (TH5) sensor error
P9
E6,E7
Indoor/outdoor unit communication error
P4 Drain sensor error/Float switch connector (CN4F) open
P5 Drain pump error
Forced compressor stop (due to water leakage abnormality)
PA
Freezing/Overheating protection operation
P6
Communication error between indoor and outdoor units
EE
Pipe temperature error
P8
Remote controller signal receiving error
E4, E5
– –
– –
Indoor unit control system error (memory error, etc.)
Fb
Refrigerant circuit abnormal
PL
Remote controller transmission error
E0, E3
E1, E2 Remote controller control board error
Wired remote controller
Check code
Indoor/outdoor unit communication error
E9
(Transmitting error) (Outdoor unit)
Compressor overcurrent interruption
UP
U3,U4 Open/short of outdoor unit thermistors
UF Compressor overcurrent interruption (When compressor locked)
Abnormal high discharging temperature/49C operated/
U2
insufficient refrigerant
Abnormal high pressure (63H operated)/Overheating
U1,Ud
protection operation
Abnormal temperature of heat sink
U5
Outdoor unit fan protection stop
U8
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
U9,UH
abnormal synchronous signal to main circuit/Current sensor error
– –
– –
Others
Other errors (Refer to the technical manual for the outdoor unit.)
Beep Beep
1 st 2 nd · · · Repeated
Off On On
Approx. 2.5 sec. 0.5 sec. 0.5 sec.
Number of flashes/beeps in pattern indicates
the check code in the following table
Beep
3 rd n th
On On Off
0.5 sec. 0.5 sec. Approx. 2.5 sec.
Symptom
Symptom
19
Beep Beep
1 st 2 nd · · · Repeated
On On On
Approx. 3 sec. 0.5 sec. 0.5 sec.
Number of flashes/beeps in pattern indicates
the check code in the following table
Remark
Remark
For details, check
the LED display
of the outdoor
controller board.
As for outdoor
unit, refer to
outdoor unit's
service manual.