Drain Overflow Protection; Drain Pump (Dp) - Mitsubishi Electric PUMY-P112VKM1 Service Manual

Check code
2502
Abnormal points and detection methods

Drain pump (DP)

1Let drain sensor self-heated, and if temperature rises slightly, as
suspensive abnormality operation stops and changes to protect mode of
restarting in 3 minutes.
2Drain pump is abnormal if the condition above is detected during
suspensive abnormality. <2502> is displayed.
3Malfunction of drain pipe is constantly detected during drain pump operation.
4The unit enters to forced outdoor unit stop when following conditions, a
and b, are satisfied (while the above mentioned detection is performed).
aThe drain sensor detects to be soaked in the water 10 times in a row.
bDetected that [liquid pipe temperature−room temperature] [ −10: for
30 minutes constantly.
Notes:
1. When the drain sensor detects to be NOT soaked in the water, the
detection record of a and b will be cleared.)
2. Drain pump abnormality (above 1–3 is detected before it becomes an
outdoor unit forced stop condition).
5When indoor unit detects above 4 condition, outdoor unit in the same
refrigerant sytem stops. Also, indoor unit except for Fan or OFF mode unit
stop. <2502> is displayed on stopped unit.
6Detection timing of forced outdoor unit stop
Constantly detected during unit operation and stop
7Releasing 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 1–3 and 4–7 are detected independently.
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Start cooling operation.
Does the drain pump work?
No
Continue to the next page
OCH576
Drain overflow protection
Diagnosis
Yes
Is the drain level unusually
high?
No
Is there an adhesion
of water drops on the
drain sensor?
No
<Drain sensor models>
Causes and check points
1 Malfunction of drain pump
2 Defective drain
Clogged drain pump
Clogged drain pipe
3 Water drops on 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 the cause of trouble.
Check the drain discharge system for:
· Dirty drain pan (needs to be cleaned)
· Clogged drain pump
· Clogged or reverse connection of drain pipe
Solve the problem.
· Remove water drops.
· Remove foreign substance such as dusts.
Yes
65
Chart 1 of 3
Remedy
Check cod