Mitsubishi SEZ-A12AR - TROUBLESHOOTING; Troubleshooting Cautions and Self-Check Procedures; Trouble Codes and Symptoms

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6
TROUBLESHOOTING
6-1. Cautions on troubleshooting
(1) Before troubleshooting, check the followings:
1 Check the power supply voltage.
2 Check the indoor/outdoor connecting wire for mis-wiring.
(2) Take care the followings during servicing.
1 Before servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then turn
off the breaker.
2 When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the
components.
3 When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
PAR-20MAA
ON/OFF
ERROR CODE
CHECK
CHECK MODE
FILTER
CHECK TEST
TEMP.
TIMER SET
A
B
C
ERROR CODE
CHECK
CHECK MODE
CHECK
CHECK MODE
DE
6-2. Self-check function
Wired remote controller
(1) Turn on the power.
(2) Press the [CHECK] button twice.
(3) Set refrigerant address with [TEMP] button
if system control is used.
(4) Press the [ON/OFF] button to stop the
self-check.
AA
CHECK button
BB
Refrigerant address
CC
TEMP button
DD
IC : Indoor unit
OC : Outdoor unit
EE
Check code
• For description of each check code, refer to the following table.
5101
5102
2503
2502
1503
0405, 1501, 4210, 5102
6831~6834
6800
– – – –
F F F F
Room temperature thermistor error
RT12, RT13, Outdoor thermistor error
Drain sensor error
Drain pump error
Freezing safeguard operation
Outdoor unit error
Signal error between remote controller and indoor units
Communication error between indoor and outdoor units
No alarm history
No unit
1 Check code Symptom
• On wired remote controller
1 Check code displayed in the LCD.
OC303-A-1.qxp 04.9.21 4:08 PM Page 11