Imax b6ac temp alert when charge the lipo battery

General
1

Hi;

I used imax b6ac for charge lipo 3s 5200 mah battery.
When I plugged it again to charger, temp alert is taken from charger like below image.

IMG_6674
IMG_6674.jpg480×640 44 KB

Then return
IMG_6675
IMG_6675.jpg480×640 44.1 KB

Then return temp alert again with beep sound.
Battery is not charged with this alert. Charger or battery is not hot. But temp error is still there. I unplugged from lipo battery.
How can I solve it? Have you any idea?