Tom M. 11-1-24 no heat. Customer stated she tried to turn the thermostat to heat this morning and it would not work. Turned tstat furnace comes on and operates as normal. Cycled furnace several times with no issue. She stated there was no numbers in the top right hand corner of the tstat for the set point. Advised the customer the circuitry in the thermostat could be going bad. She wants to wait until it stops working before she replaces it. Completed a furnace visual safety inspection and noticed no issues. System is heating properly at this time.