Why do I hear draining water or a motor rotation sound from my Mitsubishi Mr.Slim SEZ-KD25?
- NNancy GarrettSep 1, 2025
When cooling operation stops, the drain pump operates and then stops. Wait approximately 3 minutes.

Why do I hear draining water or a motor rotation sound from my Mitsubishi Mr.Slim SEZ-KD25?
When cooling operation stops, the drain pump operates and then stops. Wait approximately 3 minutes.
Why do the vanes move up and down past the set position when I change the airflow direction on my Mitsubishi Air Conditioner?
When the airflow direction is changed, the vanes move to the set position after detecting the base position.
Why does my Mitsubishi Air Conditioner cause an unpleasant odor in the room?
The indoor unit draws in air that contains gases produced from the walls, carpeting, and furniture as well as odors trapped in clothing, and then blows this air back into the room.
What does it mean if an error code appears on my Mitsubishi Mr.Slim SEZ-KD25 remote controller display?
If an error code appears on your Mitsubishi Air Conditioner's remote controller display, the protection devices have operated to protect the air conditioner. Do not attempt to repair this equipment by yourself. Turn off the power switch immediately and consult your dealer. Be sure to provide the dealer with the model name and information that appeared in the remote controller display.
What to do if my Mitsubishi Mr.Slim SEZ-KD25 stops without pressing the ON/OFF button?
If your Mitsubishi Air Conditioner shuts down unexpectedly, first check if the off timer is set; if it is, press the ON/OFF button to restart operation. Also, determine if the air conditioner is connected to a central remote controller, and if so, consult the relevant personnel. Check the remote controller display for “ ”. If it appears, consult the concerned people who control the air conditioner.
Why does the operation lamp flash near the receiver on my Mitsubishi Air Conditioner?
The self diagnosis function has operated to protect the air conditioner. Do not attempt to repair this equipment by yourself. Turn off the power switch immediately and consult your dealer. Be sure to provide the dealer with the model name.
Why does my Mitsubishi Mr.Slim SEZ-KD25 smell?
The indoor unit draws in air that contains gases produced from the walls, carpeting, and furniture as well as odors trapped in clothing, and then blows this air back into the room.
Why does my Mitsubishi Mr.Slim SEZ-KD25 emit water or vapor from the outdoor unit?
During cooling mode, water may form and drip from the cool pipes and joints. During heating mode, water may form and drip from the heat exchanger. Also, during defrosting mode, water on the heat exchanger evaporates, and water vapor may be emitted.
How to fix Mitsubishi Air Conditioner that does not heat or cool well?
If your Mitsubishi Air Conditioner isn't heating or cooling properly, several factors could be the cause. First, a dirty or clogged filter can reduce airflow, so cleaning the filter is essential. Ensure that the temperature is adjusted correctly. Also, make sure there is enough space around the outdoor unit and that neither the indoor unit's air intake nor outlet is blocked. Check if any doors or windows are open.
Why is water or vapor emitted from my Mitsubishi Mr.Slim SEZ-KD25 outdoor unit?
During cooling mode, water may form and drip from the cool pipes and joints. During heating mode, water may form and drip from the heat exchanger. During defrosting mode, water on the heat exchanger evaporates and water vapor may be emitted.
| Brand | Mitsubishi |
|---|---|
| Model | Mr.Slim SEZ-KD25 |
| Category | Air Conditioner |
| Language | English |
Details the visual display section of the wired remote controller, showing various indicators.
Describes the buttons and layout of the wired remote controller's main interface for operation.
Details the procedure for switching the air conditioner on and off using the remote control.
Guides the user through choosing different operational modes like Cool, Heat, Dry, and Fan.
Explains how to adjust the desired room temperature using the remote controller buttons.
Guides on setting up and using the weekly timer for scheduled operations.
Explains how to set a simple timer for start or stop operations within a 72-hour period.
Solutions for issues like poor heating/cooling, delayed start, or unexpected operation stops.
Guidance for resolving timer setting errors and interpreting various error codes displayed.












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