Is the flight tag removed? If it is, it will remain in airplane mode until it is replaced. 

I’d recommend giving this a read. 

If the flight read tag is installed, then you’ll have to call Dyson for a repair. 

The flight tag is installed, i had installed it as non airplane mode, however when i turn on my dyson, the screen show airplane mode which diaable me to set the temperature. If i contact dyson, it can be repaired? Normally is that an issue with the battery? Thanks

If it were battery related, I don’t think it would turn on. I’d rather think the the is faulty. They may just send you a new tag. 

Thanks CharlieBoy1 for the advise. I feel sad since I just bought it 6 days ago when I was in Japan and now having issue when I back to Jakarta, Indonesia. Anyway, I just sent it to Dyson service center in Jakarta, they need to check within 1-3 days, hope it can be solved and I can use my Dyson corrale again.