Self-Diagnosis - Mitsubishi Electric M Series Installation Manual

SELF-DIAGNOSIS

- S SERIES
SLZ-M
1 Press the button
is enabled (WEEKLY is on), press the
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)
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)
check is completed.
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
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
to stop the air conditioner. If the weekly timer
button to disable it (WEEKLY
go off and the self-
[Output pattern A] Errors detected by indoor unit
Wired remote
controller
Check code
[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
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) Overtheating 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 synchronous signal to main
U9, UH
circuit/Current sensor error
- –
- –
Others Other errors (Refer to the technical manual for the outdoor unit)
of
P1 Intake sensor error
P2, P9 Piped (liquid or 2-phase pipe) sensor error
E6, E7 Indoor/outdoor unit communication error
P4 Float switch connector open
P5 Drain pump error
PA Forced compressor error
P6 Freezing (during cooling operation) Overheating protection operation (during heating operation)
EE Assembly error (system error)
P8 Pipe temperature error
E4 Communication error between wired remote controller and indoor unit
– –
PB (Pb) Indoor unit fan motor error
FB (Fb) Indoor unit control system error (memory error, etc.)
PL Refrigerant circuit abnormal
Symptom
MITSUBISHI ELECTRIC / DIAGNOSTIC
Symptom
Remark
For details, check the
LED display of the
outdoor controller board
107