Press Mode to select the operation mode. Each press changes mode in the following order. 3. Press Up or Down arrow to set the temperature. Each press raises or lowers the temperature by 1°C. 4. Press On/Off to stop the operation. Operation indicator lamp. The operation indicator lamp shows the operation state of the unit. We have 12 Mitsubishi Electric MSZ-GL15NA manuals available for free PDF download: Manual, Service Manual, Operating Instructions Manual, Installation Manual, User Manual. Mitsubishi MSZ-GL12NA Manual. Remote control, Specs etc. Brand: Mitsubishi Electric | Category: Air Conditioner | Size: 3.92 MB. Table of Contents. Page 9: Front Panel. LEANING Instructions: • Switch off the power supply or turn off the breaker before cleaning. • Use only diluted mild detergents. • Be careful not to touch the metal parts with your hands. • Do not expose parts to direct sunlight, heat, or fi re to dry. If you experience your mini split or Mitsubishi mini split heat not working, check the timer settings. Disable them if you don’t intend to use them. Incorrect timer configurations can cause the heat mode to turn off unexpectedly. • This may cause an electric shock. Do not clean the air con-ditioner with water. • Water may enter the unit and de-grade the insulation. This may cause an electric shock. Do not put a pet or house-plant where it will be ex-posed to direct airflow. • This could injure the pet or plant. Do not use an insecticide or flammable spray. Heat: Remote controller controls only in the heating mode. Drying: Remote controller directs indoor unit to remove moisture out of the air. May result in temperatures below your cool setting. Auto: Remote controller automatically selects heating or cooling depending on the indoor temperature. Off: Indoor unit is off. This is our 3rd Mitsubishi Reverse Cycle air conditioner, the first two were perfect still working after a year or so but this 3rd one stopped working, no heating ( but cooling still works as tested) less than a week after being installed. I just finished filling up a warranty service and want to see how that comes along. ok it is either the controller that is bad or the circuit board in the indoor unit. the easiest way to tell would be to swap it with another one since you have multiple units. use a screwdriver to pry on the tap on the bottom and pull it off the wall, disconnect the small 2 wire plug on the back and swap it with another units controller. if it still does the same thing on another unit then the .

mitsubishi electric air conditioner heat mode not working