Lennox iComfort keeps restarting: separating a control reboot from an equipment fault

What Does Error Control restart Mean?

A Lennox iComfort control that restarts on its own is describing its own operating conditions rather than a heating or cooling fault. What the control needs is a stable supply from the equipment to stay running, and a supply that dips, a loose conductor, or a software condition can all produce a reboot that looks alarming and means something specific. Applies to: Lennox iComfort communicating thermostats and the equipment controls they are paired with This covers Lennox iComfort communicating controls paired with compatible Lennox equipment. A Lennox system using a conventional thermostat behaves differently, and a restart on a non-Lennox control fitted to Lennox equipment is outside what Lennox documents. Identify the control model from its own settings menu. Owner-safe checks: Keep a short log of each restart with the time and what the heating or cooling system was doing in that moment. | Note which settings survive a restart and which have to be entered again. | Check whether any recent electrical work, network change, or equipment service preceded the behaviour. Qualified technician: Inspecting control wiring at the equipment, measuring supply under load, and updating control firmware are dealer tasks on a communicating system. | Do not add or move conductors at the control or the equipment to try to stabilise the supply. Communicating systems use those conductors for data as well as power.