Armstrong Furnace R37520B016 Rollout Switch 318518-761 The onboard system diagnostic LED

The onboard system diagnostic LED provides clear fault codes

For technicians working on large-scale chillers or RTUs

veteran techs recommend a full service every 6 to 12 months

Smith combustion safety switch into your preventive maintenance routine ensures consistent burner performance and system reliability across compatible commercial and residential heating platforms

Armstrong Furnace R37520B016 Rollout Switch 318518-761 The onboard system diagnostic LEDThe Armstrong Furnace R37520B016 Rollout Switch is a vital safety component engineered for precision in high efficiency heating systems. Known by its technical specification as an L275F rollout switch, this thermally activated device is designed to detect flame rollout conditions, protecting your furnace from damage and ensuring safe operation. When heat exchanger issues cause flames to escape the combustion chamber, this high limit manual reset