The two circled in red are the "Good Morning" and "Good Night" buttons. If you have the model number of the heater we can try to find a manual online and confirm the function and use. I think you can use the heater safely even if you don't use those buttons at all; they just add extra convenience or functionality.
All the buttons and functions are the same. The only difference is the two buttons on the right. I don't know the details of their function.I told you I will research it for you if you tell me the model number of the heater. What is the model number?
The explanation is from pages 18-20. I have to go to work now and can't write instructions for you for several hours. If someone else would like to do it, please feel free.
The "Good morning" button (おはよう) is for starting up the heater automatically at a certain time point. It works as follows:
Make sure the desired temperature is set
Press タイマー合わせ
Turn the タイマー調節 dial to set the hour
Press タイマー合わせ
Turn the タイマー調節 dial to set the minutes
Press タイマー合わせ
Press おはよう (the LED above the button will switch on)
From now on, the heater will make sure that the room reaches the desired temperature by the specified time. To disable this feature, simply press the おはよう button again (the LED will turn off).
The "Good night" button (おやすみ) simply switches the heater off an hour after you press it.
The explanation is from pages 18-20. I have to go to work now and can't write instructions for you for several hours. If someone else would like to do it, please feel free.