Troubleshooting Procedure; Troubleshooting Flowchart; One-Point Service - Mitsubishi MJ-E16S-S1 Service Manual

7. Troubleshooting Procedure

7.1 Troubleshooting flowchart

The unit does not operate
Control board connector check
With the power plug removed from the
receptacle, remove and insert each connector
two to three times to improve its contact. Then,
insert the power plug into the receptacle to
make an operation check. Make sure that the
flat cable and the connectors are inserted
straight.

7.2 One-Point Service

Compressor does not start
Compressor failure
Action: Replace the compressor
26
Start
Check AC power supply
Normal
Has the fuse blown out?
Not blown
Is the float switch turned on?
ON
Uncorrected
Replace control board
Fan does not start
Fan motor failure
Action: Replace
the fan motor
The compressor does not operate in Air purifier
mode.
Abnormal
Restore AC power supply
Blown
Replace fuse
OFF
Mechanical check
• Correct defects.
• Replace the switch if
defective.
Unit does not run
Float switch operation check
Power button
operation check
Control board leadwire
connection check
Control board failure
Action: Replace
the control board