As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4149 CREW REPORTED BURNING SMELL IN COCKPIT ON CLIMB. RETURNED TO ORD. NO SMOKE WAS DETECTED. THE AIRCRACFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE CAPTAINS WINDSHIELD TEMPERATURE CONTROLLER IAW EMB 145 AMM 30-42-01. THE AIRCRAFT WAS RETURNED TO SERVICE.