A condensate overflow detection device includes a frame, a housing, an affixing device, a surface placement mechanism, a float and an actuator. The housing has a bottom and a plurality of pan engagement side surfaces extending upwardly from the bottom, each of which is disposed at a different angle relative to the bottom surface. The housing defines a vent structure passing therethrough that allows water to pass into the housing. The affixing device clamps a pan engagement side surface to a sidewall of a secondary condensate pan. The surface placement mechanism places one of the pan engagement side surfaces opposite from the affixing device. The float, disposed within the housing, has a first position when no water has entered the housing and a second position when a predetermined level of water has entered the housing. The actuator causes an event when the float is in the second position.