Mitsubishi Electric PUMY-P100VHMB Service Manual page 45

Display
Abnormal point and detecting method
2502
Drain pump (DP)
(Drain
Let drain sensor self-heated, and if
sensor temperature rises slightly, as suspensive
model)
abnormality operation stops and changes to
protect mode of restarting in 3 minutes.
Drain pump is abnormal if the condition
above is detected during suspensive
abnormality. <2502> is displayed.
Malfunction of drain pipe is constantly
detected during drain pump
operation.
The unit enters to forced outdoor unit stop
when following conditions, a) and b), are
satisfied (while the above mentioned
detection is performed).
a) The drain sensor detects to be
soaked in the water 10 times in a row.
b) Detected that
[liquid pipe temperature –
room temperature] -10deg[-18°F] for
30 minutes constantly.
(
When the drain sensor detects to be
NOT soaked in the water, the detection
record of a) and b) will be cleared.)
Drain pump abnormality (above
detected before it becomes an outdoor unit
forced stop condition.
When indoor unit detects above
outdoor unit in same refrigerant sytem stops.
Also, indoor unit except for Fan or OFF
mode unit stop. <2502> is displayed on
stopped unit.
Detection timing of forced outdoor unit stop
Constantly detected during unit operation
and stop
Releasing of forced outdoor unit stop
Reset power supply of both abnormal indoor
unit and its outdoor unit in same refrigerant
system. Forced outdoor unit stop cannot be
released by remote controller OFF.
NOTE )
Above-mentioned
detected independently.
Malfunction of drain pump
Defective drain
Clogged drain pump
Clogged drain pipe
Water drops on drain sensor
• Drops of drain trickles from lead wire.
• Clogged filter is causing wave of drain.
Defective indoor controller board
Both of above mentioned
indoor linear expansion valve full-closed
failure (leakage) happens synchronistically.
(Note) Address/Attribute displayed on
the remote controller shows the indoor
)
unit which is cause of trouble.
~ ) is
condition,
~ and ~ are
Causes
~ and the
45
Check points
Check if drain pump works.
Check drain function.
Check the setting of lead wire of drain
sensor and check clogs of the filter.
Replace indoor controller board when
there is no problem in the above
mentioned ~ .
Check whether the indoor linear
expansion valve leaks or not.