One appliance and crew from Newport Pagnell and two from West Ashland attended.
The building was evacuated. A kiln had overheated causing smoke.
The firefighters isolated the kiln, and used positive pressure ventilation to help clear the smoke.
One appliance and crew from Buckingham, one from West Ashland, one from Brackley and two officers attended, and were at the scene for about four hours. Firefighters used gas monitors, breathing apparatus and fans and assisted with the temporary evacuation of residents from about 100 flats.
The high carbon monoxide levels were caused by generators in the previously flooded basement car park. A phased return of residents to their flats began early this evening.
Other agencies attending included Thames Valley Police, Buckinghamshire Council, South Central Ambulance Service and its Hazardous Area Response Team.