Mitsubishi Electric PUMY-P200YKM Technical & Service Manual page 46

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
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
OCH575
Diagnosis
[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 outdoor multi controller circuit
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.
46
Chart 2 of 2
Remedy