Mitsubishi Electric PUMY-P100VHM Technical & Service Manual page 36

Display
Meaning and detecting method
2502 Malfunction of drain pump (DP)
1 Suspensive abnormality, if thermistor of
drain sensor is let heat itself and tempe-
rature rises slightly. Turn off compressor
and indoor fan.
2 Drain pump is abnormal if the condition
above is detected during suspensive
abnormality. <2502> is displayed.
3 Constantly detected during drain pump
operation.
4 The unit has a forced outdoor unit stop
abnormality when the following conditions,
a and b, are satisfied while the above-
mentioned detection is performed.
a) The drain sensor is detected to be
soaked in the water 10 times in a row.
b) The intake temperature subtracted with
liquid pipe temperature is detected to be
less than -10: for a total of 30 minutes.
(When the drain sensor is detected to
be NOT soaked in the water, the
detection record of a and b will be cleared.)
w Abnormality by malfunction of drain pump
(above 1~3) is detected before it be-
comes an outdoor unit forced stop condition.
5 When condition which the outdoor unit is
stopped forcibly consists, or the drain sensor
detects continuously to go under water 10
times, and also detects ''[liquid pipe
temperature-suction temperature][ -10deg''
for 30 minutes continuously, the indoor unit
stops abnormally (however, fan operates by
normal control) that indoor unit and ex-
cluding [Fan mode or OFF] in same
refrigerant system. Also, the outdoor unit
which is connected to that indoor unit with
refrigerant system stops abnormality
(compressor is inhibited to operation).
In this time, <2502> is displayed.
6 Forced outdoor unit stop Detection timing
operation / Stop detection always
7 Forced outdoor unit stop at end condition
Both of power supplies of the abnormal
indoor unit and outdoor unit are reset.
Even if the ON/ OFF button of remote
controller is turned off, abnormality is not
released.
NOTE )
Above-mentioned 1~3 and 4~7 are
detected mutually independently.
Causes
1 Malfunction of drain pump
2 Defective drain
Clogged drain pump
Clogged drain pipe
3 Attached drop of water at the drain sensor
• Drops of drain trickles from lead wire.
• Clogged filter is causing wave of drain.
4 Defective indoor controller board.
5 Both of above mentioned 1~4 and the
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.
36
Check points
1 Check if drain-up machine works.
2 Check drain function.
3 Check the setting of lead wire of drain
sensor and check clogs of the filter.
4 Replace indoor controller board if drain
pump operates with the line of drain
sensor connector CN31-1 and 2 is short-
circuited and abnormality reappears.
Turn the power off, and on again to
operate after check.
Check whether the indoor linear expansion
valve leaks or not.