What Does System On +2 Mean on My Thermostat in Wake Forest?
Wake Forest · November 2026 · Autumn · From our service records
What the customer reported
A Wake Forest homeowner reported the system was blowing cool air and the thermostat was displaying "System On +2," which they had not noticed before. The heating system had been serviced the week before, and the temperature rose but did not reach the set point.
What we found and did
The second-stage heat was failing at the gas valve. Autumn checked the thermostat and system, confirmed no active schedule was programmed, and explained that "System On" means first-stage operation is energized while "System On +2" means second-stage operation is energized. She cycled the system through both heating stages, confirmed proper voltage to the gas valve, and verified gas pressure. She recommended a repair to restore second-stage heating, and the homeowner signed for it.
Result
First-stage heat operated properly during testing, while second-stage heat was not functioning as intended and still needs the recommended repair.
