Have HVAC Questions? Ask an HVAC Expert for Answers
Have you tried replacing the batteries?
Do you notice any difference when using the stylus or your finger ?
If you press harder or hold longer, will it eventually change?
I know this is not the answer you want, but Rite Temp are cheap and well known to be unreliable thermostats.Erratic behavior even often changing settings on their own.The computer board has probably taken a power surge causing the isues. Best thing to do is replace it with a Honeywell,White Rodgers or Robertshaw thermostat.I prefer the Honeywell . You can get a decent Honeywell at Lowes for around 50 bucks.
Sorry ,had a phone call. I like the Honeywell RTH 8500
They run about 100 bucks at Lowes or Home Depot.
If you don't want touchscreen, the 6350 is about 50 bucks and does all that the Rittemp you have