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How to use heating mode on an MHI air conditioner
Select HEAT, choose a comfortable temperature and give the unit time to start. A simple guide to heating with your MHI air conditioner.
To heat a room with a suitable Mitsubishi Heavy Industries air conditioner, select HEAT, switch the unit on and set a target above the current room temperature. In MyAirco, use the mode control for HEAT rather than raising the temperature while the unit is still in COOL.
Start with a simple setup
- Choose the correct roomIf you have several units, check the device name before changing settings. Give rooms clear names such as “Living room” and “Bedroom”.
- Select HEATThe sun symbol on many remotes represents heating. In the app, check the mode name rather than relying only on the colour of the screen.
- Set a reasonable targetFor example, try 20°C and adjust for comfort once the room has had time to respond. This is a starting point, not a required temperature for every home.
- Start with automatic fan speedLet the unit manage airflow, then adjust it if needed. Keep furniture clear of the outlet.
Why is there no warm air immediately?
The indoor fan may wait while the unit prepares to heat. A pause does not automatically mean that the app command failed. Check the selected mode and let the unit complete its startup sequence instead of repeatedly switching it off and on.
MHI describes heating startup and defrost behaviour in the Ciara user manual. Timing and indicator patterns depend on the model, so use your own unit’s manual for those details.
Check comfort after the room settles
Make one small change at a time. If you change the target, fan speed and airflow together, it becomes difficult to tell which adjustment helped. Check how the room feels where you sit, not only beside the indoor unit.
If it still does not heat
Try the physical remote. If the remote works but the app cannot read the unit, follow the network troubleshooting guide. If neither controller produces heat, check the unit’s indicators and manual. Write down any error code for your installer. A working Wi-Fi connection does not rule out an equipment problem, and a heating problem does not necessarily require Wi-Fi setup again.