Mitsubishi Electric PUMY-P112VKM1 Service Manual page 64

Check code Check code
2500
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards
Continued from the previous page
●Is there an adhesion of water
drops on the drain sensor?
●Is there a difficulty when
pulling up the float switch
manually?
No
[Drain sensor]
Disconnect the connector for
drain sensor (CN31) and short-
circuit between pins 1-2 on the
indoor controller board, then turn
ON the emergency operation
switch (SWE).
Is the check code
<2500> still displayed?
Yes
OCH576
Diagnosis
Yes
[Float switch]
Disconnect the connector for float
switch (CN4F) and short-circuit
between pins 3-4 on the indoor
controller board, then turn ON
the emergency operation switch
(SWE).
No
Water leakage
No abnormality
The cause might be that the drain level
was unusually high.
Restore the controller board, and operate
the unit.
Replace the indoor controller board.
Note that when controller board is
defective in a usual case, the check code
<2500> is not displayed.
64
Chart 2 of 2
Remedy
Solve the problem.