AC thermostat display indicates that the stove is not included. Check the circuit breakers or fuses and look for a switch to make sure the oven and it lights up. If that does not work, of course the owner is calling a service, because it was a malfunction with the furnace itself, not the thermostat.

Hit Run Program. to see when it comes to heat. Did it work before? does not follow the instructions on the inside of the lid