A Light Sport Aircraft pilot reported a gear up landing due to a faulty squat switch.

Narrative

Landing gear was selected down on approach. Observed safe gear indications. Upon landing the gear was not extended. Landed gear up on the hull of the aircraft. Squat switch that is closed when gear is extended via contact with the gear jackscrew shuttle was still closed after initial gear retraction. The squat switch; when depressed/closed turns off the gear jackscrew motor and turns on the gear safe lights. This switch was found to be closed after the landing when attempting to lower the gear after jacking up the aircraft. The switch arm was not in contact with anything; yet the switch was depressed closed. In this condition; after initial gear retraction; the switch prevented the jackscrew motor from activating when the gear handle was placed in the down position; yet it also gave a safe gear indication contrary to the actual position of the gear; which was still retracted. After opening the squat switch by hand; the gear operated and extended normally. The aircraft was taxied to the hangar without further incident. Damage to the carbon fiber/fiberglass hull was minimal. No other damage to the aircraft or facility. Contributing factor to the gear up landing was not visually checking the actual gear position after moving the gear lever to the down position.