Heating randomly stays on and exclamation mark present!

bob_e70

My Tado V3+ system and TRVs have been fitted for 3 months with no problems. However, on a couple of occasions the central heating will remain on past the thermostat set temperature.

The heating then remains on no matter what I do, unless I hard reset the Tado sender unit in the airing cupboard.

I also notice that the sender unit displays the exclamation mark led when this problem occurs.

is there any reason why this is happening? I am starting to worry that the fault will happen when I am out of the house and the hallway will just continue to heat past 30 degrees C 😳

Here are some photos of the sender unit and my app displaying high temperatures