Woke up in the middle of the night rather hot. Felt the radiator in the bedroom and it was red hot. Checked the room stat (DT90E) on the landing and the temp was showing 25C set at 21C. Checked the programmer and both heating and hot water were off, the boiler was still running. Radiators cold downstairs and room stat 20C set 21.5C. Had to turn the power to the boiler off to stop it running. We had a short power cut in our street on Fri night 20.00 hrs. and it came back within 5 mins. Any ideas, heating has gone off this morning but boiler still running.