Homeowner concerns our intermittent operation and temperature dropping. Thermostat always responds and turns on if temperature is adjusted up. Generation 1 vision pro 8000 touch screen. 2-stage heat one stage cool Upon arrival today the thermostat was at the set temperature and satisfied. System did cycle on and off multiple times under the thermostat normal control. Resurface flame sensor, inspect and blowout drain trap, test run equipment in multi-stage heat, maximum temperature on high heat reached 121°f Inspect thermostat wiring and AAA batteries. No low battery indicators and no corrosion. Duracells dated 2015