Mitsubishi Electric PUMY-P112VKM1 Service Manual page 69

Check code Check code
2502
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Continued from the previous page
Is the connector CNP
connected properly?
Yes
Turn ON the emergency
operation switch (SWE).
Is 200 V AC output on
the connector CNP?
Yes
Check the voltage on both ends
of the branch connector.
Is 200 V AC output?
Yes Yes
OCH576
Drain overflow protection
Diagnosis
No
Is there a difficulty on the
moving part when pulling up
the float switch manually?
No
Is the resistance of float
switch normal? *
Yes
Yes (Short)
Yes
Disconnect the connector for
float switch (CN4F) and short-
circuit between pins 3-4 on the
indoor controller board, then start
cooling operation.
Is the check code
<2502> still displayed?
Yes
No
No
No
<Float switch models>
Solve the problem.
Yes
· Remove foreign substance such as dusts.
· Replace if the moving parts does not work.
Replace the float switch.
No
(Open)
*Please refer to "How to check
the parts" on indoor units service
manual.
No abnormality
· The cause might be that the drain level was
unusualy high.
· Restore the float switch, and operate the unit.
Connect the connector (CN4) properly.
Replace the indoor controller board.
Check the branch connector for breakage
or contact failure.
Replace the drain pump.
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Remedy