Mitsubishi Electric PUMY-P112VKM1 Service Manual page 66

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
No
Is the connector CNP
connected properly?
Yes
Turn ON the emergency
operation switch (SWE).
Is 200 V AC output on
the connector CNP?
Yes
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OCH576
Drain overflow protection
Diagnosis
Is the resistance of drain
sensor normal?
<How to check the resistance>
Disconnect the connector for drain sensor from the indoor controller board to check the
resistance using a tester.
Temperature Resistance
6.0 kΩ
0
3.9 kΩ
10
2.6 kΩ
20
2.2 kΩ
25
1.8 kΩ
30
1.3 kΩ
40
0.6 kΩ
60
Yes
Disconnect the connector for
drain sensor (CN31) and short-
circuit between pins 1-2 on the
indoor controller board, then start
cooling operation.
Is the check code
<2502> still displayed?
Yes
No
No
<Drain sensor models>
No Replace the drain sensor.
10
9
8
7
6
5
4
3
2
1
0
-20
No abnormality
The cause might be that the drain level
was unusually high.
No
Restore the drain sensor, and operate the
unit.
Connect the connector (CN4) properly.
Replace the indoor controller board.
66
Chart 2 of 3
Remedy
<Drain Sensor>
0 20 40 60 80
Temperature(°C)