Why does fog occur during heating operation of Panasonic U-10ME1E81?
- AAnthony WardSep 18, 2025
The fog that you notice during heating operation indicates that the defrost operation is in progress.

Why does fog occur during heating operation of Panasonic U-10ME1E81?
The fog that you notice during heating operation indicates that the defrost operation is in progress.
Why is my Panasonic U-10ME1E81 cooling or heating poorly?
If your Panasonic Air Conditioner's cooling or heating performance is poor, check if the air inlet or outlet of the indoor and outdoor units are blocked by dust and remove any dust. Also, ensure the air speed control is set to 'High' or 'Strong'. Verify that the temperature settings are correct by lowering the temperature setting or setting it to 'High' or 'Strong'. Finally, consider that direct sunlight exposure in cooling mode can affect performance.
Why does my Panasonic Air Conditioner not start immediately?
Operation is not activated for the first approx. 3 minutes because compressor protection circuit is activated.
Why does my Panasonic Air Conditioner sound like water is running?
The sound of streaming water you hear is likely the sound of refrigerant liquid flowing inside the unit during or after operation or the sound of drainage water through the drain pipe.
Why does my Panasonic U-10ME1E81 fan rotate faster than the set speed?
The fan may rotate faster than the set speed during the initial high-speed operation for an operation check to confirm that the fan motor rotation is within the proper range.
What to do if fog occurs during cooling operation of Panasonic U-10ME1E81 Air Conditioner?
If your air conditioner is installed in a place with a lot of oil mist, like a restaurant, the fog during cooling operation means the unit inside (heat exchanger) is dirty. Contact your dealer.
Why is the wind direction changing on my Panasonic Air Conditioner and I can't adjust it?
Your Panasonic Air Conditioner may automatically adjust to a horizontal wind flow when the air discharge temperature is low, or during defrost operation. Also, the flap position is occasionally set up individually.
What causes noise in my Panasonic Air Conditioner unit?
This sound may be caused by the sound of refrigerant liquid flowing inside the unit or the sound of drainage water through the drain pipe. Also, a cracking sound can occur due to temperature changes of parts.
Why does the fan on my Panasonic U-10ME1E81 rotate faster than the setting speed at the initial high-speed operation?
This happens for operation check in order to confirm whether the fan motor rotation is within use range.
Why is there dewdrop on my Panasonic U-10ME1E81?
Indoor moisture is cooled by cool wind and accumulated by dewdrop.
| Brand | Panasonic |
|---|---|
| Model | U-10ME1E81 |
| Category | Air Conditioner |
| Language | English |
Explains symbols used to alert users to potential hazards.
Recommends qualified technicians and voltage checks for proper installation.
Warns against installing near flammable gases or in humid/hot environments.
Details requirements for wiring, grounding, and qualified electricians.
Instructs to turn power mains on for at least five hours before operation.
Covers hazards like refrigerant, wet hands, flammable vapors, and explosive atmospheres.
Addresses safe operation, avoiding obstructions, and proper handling.
Specifies R410A refrigerant and its Global Warming Potential (GWP).
Outlines recommended indoor/outdoor temperature ranges for cooling and heating modes.
Provides guidance on proper disposal of electrical products and batteries.
Identifies key parts of the indoor units, including control panels and louvers.
Refers to separate instructions for the optional wireless remote controller.
Explains the functions of buttons like Start/Stop, Mode Select, Fan Speed, and Temperature settings.
Describes the group control feature for operating multiple indoor units with one controller.
Details how to use the FLAP button for manual and swing airflow adjustments.
Shows initial and continuous settings for airflow direction in different modes.
Explains auto flaps and setting airflow for Y2 type units.
Details vertical (automatic) and horizontal (manual) airflow adjustments for K2 type.
Guides on setting airflow for individual units or all units under group control.
Explains how the DRY mode operates, including fan speed and temperature limits.
Discusses heating efficiency, defrosting, and standby indicators during heating.
Provides safety warnings and instructions for cleaning indoor and outdoor units.
Covers cleaning agents, methods for panels, fins, and filters.
Explains when to clean filters and how to reset the filter indicator.
Lists common indoor unit symptoms like noise, odor, dewdrop, fog, and dust with their causes.
Lists common outdoor unit symptoms like no operation, noise, and steam with their causes.
Outlines checks for non-operation and poor performance before calling service.
Provides advice on preventing obstructions, sunlight, filter cleaning, and closing openings.
Details specifications for K2 and Y2 type air conditioners.
Provides technical data for LE1 Mini type units (single and 3-phase).
Lists technical specifications for 2WAY ME1 type air conditioners.
Details technical specifications for 3WAY MF1 and MF2 type air conditioners.












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