While the open frame design is versatile

Use extreme caution and ensure power is disconnected before inspecting the 1173828 ignitor or sparker lead

This 180-degree manual reset thermal safety switch is engineered to de-energize the burner circuit when it senses dangerous heat from blocked flues

Automatic Recovery: The auto reset mechanism minimizes service calls after temporary overheating events

Robertshaw 780-787 Ignition Module 30067439-890 While the open frame designThe Robertshaw 780 787 Ignition Module is a professional grade Hot Surface Ignition (HSI) Control engineered for high reliability performance in gas fired heating systems. This specific unit is a direct replacement for the HS780 34NR 306A, maintaining exact electrical and mechanical specifications for seamless field installation. Operating on a 120V AC supply voltage with a 24V AC control input, this module features a 34 second ignitor warm up period