The Schneider Electric AT-11-401 is a commercial-grade dual-window thermostat cover designed for Barber-Colman and Schneider Electric wall-mounted control units

OEM Compatibility: Direct fit for Rheem and Ruud gas-fired equipment

When should I replace the pressure tap

hard starting

Designed specifically for integration with Robertshaw 700 series gas valves and compatible Energy Cut-Off (ECO) sensors

Utica-Dunkirk 26878 Flame Sensor The Schneider Electric AT-11-401 isThe Utica Dunkirk 26878 Flame Sensor is a critical safety component engineered for precision monitoring in high efficiency residential and commercial boilers. As an OEM replacement flame sensor, this part is designed to detect the presence of burner ignition via flame rectification, sending a microamp signal to the integrated control board to maintain gas valve operation. A failing or fouled 26878 boiler part is the primary cause of units that cycle