Abstract: A modular electronic control housing assembly 10 having a housing 32, a removable front plate 36, and a chassis 34 for mounting control components. The housing 32 includes an enclosed top 40, an enclosed back 42, and enclosed sides 44 having flanges 48 projecting therefrom. The chassis 34 includes a base 66, a front wall 68, and flanges 70 projection from the wall 68 having a side flange 72 and outwardly projecting front flanges 74. A plurality of electrical connectors 90 are mounted to the base 66 through openings 92. When the modular spa control assembly 10 is assembled, the front flanges 74 on the chassis 34 are clamped between the front plate 36 and the flanges 48 on the sidewalls 44 of the housing 32, thus supporting the chassis 34 within the housing 32 without requiring an enclosed bottom. The control assembly 10 is quickly disassembled by unplugging the power cord 28 and the plurality of plugs 30, removing the fasteners 38 and the front plate 36, and taking the chassis 34 out of the housing 32.