Mitsubishi Heavy Industries STM25ZE User Manual (English)

Questions and Answers:

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rebecca09Aug 13, 2025
Why is my Mitsubishi Heavy Industries STM25ZE not cooling or heating properly?
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  Jillian RobersonAug 13, 2025
  Several factors can affect the cooling or heating performance of your Mitsubishi Heavy Industries Air Conditioner. Ensure that the thermostat is set to a suitable temperature. Also, a clogged air filter can reduce efficiency, so check if the air filter is clean. Finally, make sure all doors and windows are closed to prevent outside air from affecting the unit's performance.
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udelgadoAug 17, 2025
Why is my Mitsubishi Heavy Industries STM25ZE Air Conditioner cooling poorly?
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  Andrew GibsonAug 17, 2025
  Several factors might cause poor cooling in your Mitsubishi Heavy Industries Air Conditioner. Check if direct sunlight is entering the room. Also, ensure there isn't a heat source present in the room. Finally, consider if there are too many people in the room, as this can affect cooling efficiency.
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Anthony CisnerosAug 21, 2025
What to do if my Mitsubishi Heavy Industries STM25ZE Air Conditioner does not work?
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  Stephen TuckerAug 21, 2025
  If your Mitsubishi Heavy Industries Air Conditioner isn't working, first check if the power switch is turned on. Also, verify that the timer hasn't been set to the 'ON' position. Finally, check for a power failure or a blown fuse.
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Amy SkinnerAug 25, 2025
Why can't I restart my Mitsubishi Heavy Industries STM25ZE Air Conditioner immediately?
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  Sandra MartinAug 25, 2025
  To protect the unit, restarting your Mitsubishi Heavy Industries Air Conditioner is blocked for 3 minutes after it has been stopped or after switching off the power during operation. Please wait for three minutes before attempting to restart it.
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Stephanie DavisAug 28, 2025
Why does my Mitsubishi Heavy Industries STM25ZE Air Conditioner not blow air during heating?
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  Michael LunaAug 28, 2025
  When the outdoor temperature is low and humidity is high, your Mitsubishi Heavy Industries Air Conditioner may automatically perform defrosting. Please wait, as this process may take 5 to 10 minutes. During defrosting, water or steam may escape from the outdoor unit.
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Kathy BurtonSep 1, 2025
Why is no air blowing when I start the heating operation on my Mitsubishi Heavy Industries Air Conditioner?
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  vsimmonsSep 1, 2025
  When starting the heating operation, air flow may be temporarily stopped on your Mitsubishi Heavy Industries Air Conditioner to prevent cold air from blowing out until the indoor heat exchanger has warmed up. Please wait for 2 to 5 minutes.
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Samantha RogersSep 5, 2025
Why does steam escape from my Mitsubishi Heavy Industries STM25ZE Air Conditioner during cool operation?
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  Karen FloresSep 5, 2025
  Steam may escape during COOL operation of your Mitsubishi Heavy Industries Air Conditioner if the room's temperature and humidity are very high. It should disappear as soon as the temperature and humidity decrease.
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Kurt JenningsSep 8, 2025
Why is no air blown out when starting the DRY operation on my Mitsubishi Heavy Industries STM25ZE Air Conditioner?
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  Dakota WrightSep 8, 2025
  During the DRY operation, the indoor fan on your Mitsubishi Heavy Industries Air Conditioner may stop to prevent re-evaporation of dehumidified moisture and to save energy.

Mitsubishi Heavy Industries STM25ZE Specifications

General

Cooling Capacity	2.5 kW
Heating Capacity	3.2 kW
Power Supply	220-240 V, 50 Hz
Refrigerant	R32
Type	Split System
Outdoor Unit Dimensions (W x H x D)	780 x 550 x 285 mm