Mitsubishi Electric PLA-A12EA8 Service Manual page 16

• Refer to "13-7. SELF-DIAGNOSIS" to search for the error history.
[Output pattern A]
Beeper sounds Beep
OPERATION
INDICATOR
lamp blink
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 B e e p
OPERATION
INDICATOR
lamp blink
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
No sound
No sound
No sound
[Output pattern B] Errors detected by unit other than indoor unit (outdoor unit, etc.)
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.
TCH120A
Beep Beep Beep Beep
1 2 3 n
st nd rd th
On On On
On
0.5 s 0.5 s 0.5 s
0.5 s
B e e p B e e
1 st 2 nd
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 (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 (CN4F) open
P5 Drain pump error
PA Forced compressor stop(due to water leakage abnormality)
P6 Freezing/Overheating protection operation
EE Combination error between indoor and outdoor units
P8 Pipe temperature error
E4, E5 Remote controller signal receiving error
– –
Pb Indoor unit fan motor error
Fb (FB)* Indoor unit control system error (memory error, etc.)
PL Abnormal refrigerant circuit
E0, E3 Remote controller transmission error
E1, E2 Remote controller control board error
– – – – No corresponding
Wired remote controller
Check code
Indoor/outdoor unit communication error
E9
(Transmitting error) (Outdoor unit)
UP Compressor overcurrent interruption
U3,U4 Open/short of outdoor unit thermistors
UF Compressor overcurrent interruption (When compressor locked)
Abnormal high discharge temperature/49C operated/
U2
insufficient refrigerant
Abnormal high pressure (63H operated)/Overheating
U1,Ud (UD)*
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
U9,UH
synchronous signal to main circuit/Current sensor error
- -
- -
Others Other errors (Refer to the technical manual for the outdoor unit.)
Beep Beep
1 2 · · · Repeated
st nd
Off On On
Approx. 2.5 s 0.5 s 0.5 s
Number of blinks/beeps in pattern indicates
the check code in the following table
p B e e p B e e p
3 rd n th
On On Off
0.5 s 0.5 s Approx. 2.5 s
Symptom
Symptom
16
Beep Beep
1 2 · · · Repeated
st nd
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
Remarks
Remarks
For details, check the LED
display of the outdoor
controller board.
As for outdoor unit, refer
to outdoor unit's service
manual.