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When these pool heater limit switches fail
including Norton 201N and Robertshaw 41-402N
its SPDT switch action allows it to function as a low limit or circulator control on return lines
Maintains System Isolation: Prevents contaminated boiler water from re-entering the potable supply
This OEM gas conversion kit is engineered for a broad range of Sterling unit heaters
Robertshaw 780-787 Ignition Module Els PW 17895 When these pool heater limitThe 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