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Abnormal point and detecting method
Causes
Check points
2502
(Drain
sensor
model)
Drain pump (DP)
Drain sensor thermistor is heated, and when
only a fraction of the temperature rise is
detected, the system determines
abnormality to defer the error to stop
operation and changes to protection mode to
restart the system 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) The room teperature subtracted with
liquid pipe temperature is detected to be
less than -10[-18
°
F] continuously for 30
minutes.
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 ~) is
detected before it becomes an outdoor unit
forced stop condition.
When indoor unit detects above condition,
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 ~ and ~ are
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 ~ 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.
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.
( )