Temperature creep?

[Red2143]

I have a cobalt thermometer set to 76 degrees. I noticed the temperature creeping up to 80. The heater shows a flashing light on 80 so it seems the thermostat is working but wanted to confirm if this is early sign of failure?

 

[Alex Cataldo]

It seems faulty, replacing it is your best option. Generally, two independent heater controllers such as the Inkbird and two heaters will be more reliable