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Thermostat may have taken a power spike.Lets try a hardware reset first.
Press UP and DOWN arrows and TIME at same time.
We will go from here.
Ok there is one more thing you can try.As it is thermostat is worthless so if this doesn't work, the most that will happen is you still need to get another thermostat.(which you will have to do anyway if it doesn't currently operate.
There is one trick I have seen work to reset these digital thermostats that works sometimes. That is to remove batteries and install them backwards for 5 seconds, Then remove and install properly,If this does not reset the little computer board in the thermostat you will need to replace the thermostat.
Note: Occasionally , this will not work and will even cause thermostat to start smoking.If so simply remove batteries.If thermostat is not working already, it is worthless anyway, so no harm done .I have seen it work about 20 per cent of the time. So if that is something you are comfortable doing would try it.Could save you having to buy another thermostat.Otherwise, just go ahead and replace it.