Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 212; Flight Crew Total 212; Flight Crew Type 212
Distraction; Troubleshooting
Aircraft Equipment Problem Critical
Flight Crew Returned To Gate
Aircraft; Environment - Non Weather Related
Uncommanded Windshear alert and weather radar test function activation on takeoff Runway 04R  in low speed regime. Rejected takeoff; appropriate QRC and QRH accomplished. Returned for takeoff Runway 04L. Same aircraft malfunction occurred. Second rejected takeoff was performed in low speed regime. Subsequently returned to gate and swapped aircraft. Appropriate ELB entry was made.
Pilot reported an uncommanded wind shear alert and weather radar test function activation on takeoff twice; then after the second returned to the gate for an aircraft swap.