107
[Output pattern A] Errors detected by indoor unit
Wireless remote controller
Wired remote
controller
Symptom
Beeper sounds/OPERATION INDICATOR lamp blinks
(Number of times)
Check code
1
P1
Intake sensor error
2
P2, P9
Piped (liquid or 2-phase pipe) sensor error
3
E6, E7
Indoor/outdoor unit communication error
4
P4
Float switch connector open
5
P5
Drain pump error
PA
Forced compressor error
6
P6
Freezing (during cooling operation) Overheating protection operation (during heating operation)
7
EE
Assembly error (system error)
8
P8
Pipe temperature error
9
E4
Communication error between wired remote controller and indoor unit
10
–
–
11
PB (Pb)
Indoor unit fan motor error
12
FB (Fb)
Indoor unit control system error (memory error, etc.)
14
PL
Refrigerant circuit abnormal
SLZ-M
1 Press the
button to stop the air conditioner. If the weekly timer
is enabled (WEEKLY is on), press the
button to disable it (WEEKLY
is off)
2 Press the
button for 5 seconds.
•
comes on and the unit enters the self-check mode.
3 Press the button to select the refrigerant address (M-NET address) of
the indoor unit for which you want to perform the self-check.
4 Press the
button
.
if an error is detected, the check code is indicated by the numbers of beeps from
the indoor unit and the number of blinks of the OPERATION INDICATOR lamp.
1 Press the
button
•
and the refrigerant address (M-NET address) go off and the self-
check is completed.
[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
Wired remote
controller
Symptom
Remark
Beeper sounds/OPERATION INDICATOR
lamp blinks
(Number of times)
Check code
1
E9
Indoor/outdoor unit communication error
For details, check the
LED display of the
outdoor controller board
2
UP
Compressor overcurrent interruption
3
U3, U4
Open/short of outdoor unit thermistors
4
UF
Compressor overcurrent interruption (When compressor locked)
5
U2
Abnormal high discharging temperature/49C worked/insufficient refrigerant
6
U1, Ud
Abnormal high pressure (63H worked) Overtheating protection operation
7
U5
Abnormal temperature of heat sink
8
U8
Outdoor unit fan protection stop
9
U6
Compressor overcurrent interruption/Abnormal of power module
10
U7
Abnormality of super heat due to low discharge temperature
11
U9, UH
Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main
circuit/Current sensor error
12
-
–
13
-
–
14
Others
Other errors (Refer to the technical manual for the outdoor unit)
SELF-DIAGNOSIS
- S SERIES
MITSUBISHI ELECTRIC
/ DIAGNOSTIC
Summary of Contents for M-SERIES
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Page 75: ...73 MITSUBISHI ELECTRIC REPLACE TECHNOLOGY COMMERCIALE ...
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