Honeywell W8600E1032 three LED’s indicate ON, Wash, and Check. WashLED lights when a decrease is sensed in the ionizer current (as the cells get dirty the ionizer current drops). The Check LED indicates inadequate voltage from a possible cell short or excessive arcing. Color white. Size 4 x 2 x 2".
Requires 4 conductor thermostat wire. Replaces W8600E1008 (beige).