Mitsubishi Electric PURY-P200 Service Handbook page 131

Checking code Meaning, detecting method
2502 Drain pump When drain sensor detects
abnormality flooding during drain pump ON.
(This error
occurs only
for the
applied
indoor units.)
Cause
(1) Drain pump malfunction
(2) Clogged drain pump intake
(3) Clogged drain pipe
(4) Return water from drain pipe
(installation defect)
- 128 -
Checking method & Countermeasure
(1) Check the drain pump
malfunction
1Check whether there is
water in the drain pan.
When the water level is
approximately 10mm from
the bottom of the drain
pan, the drain pump may
be normal.
2Check whether the drain
pump operates properly.
Whether the resistance of
the drain pump is normal
or the drain pump
operates when the power
supply is applied.
(2) Check the clogged drain
pump intake.
Check whether there is no
dust around the drain pump
intake.
(3) Check the clogged drain pipe.
Check whether there is no
clogging outside of the pipe
body.
(4) Check the return water.
Pour approximately 1-liter
water in the drain pump, and
start the drain pump. When
the water level in the drain
pan becomes stably lower,
stop the pump, and check
the amount of the return
water to the drain pan.
✻When a large amount of
water returns, the gradient
of drain pipe may be the
reason. Check whether the
drain pipe is installed
properly as the instruction
in the installation manual
says. Furthermore, check
whether the gradient of the
unit installation is
horizontal. Error may be
detected because of the
return water depending on
the gradient. (Gradient
approximately 0.5˚)
After checking the above, when
all normal, misdetection of the
drain sensor is possible.
1Check the drain sensor.
· Check the resistance value.
<Error release method>
Reset (error reset) the
applied indoor unit with the
remote controller.