To simply specify an abnormal place in a combustor in a case where abnormality occurs in the combustor.SOLUTION: A combustion system is configured to collect and store combustion control information including at least an On time Tand OFF time Tof a wind pressure switch 17, wherein the On time Tof the wind pressure switch 17 is a time from when commanding a blower 16 to turn on the wind pressure switch 17 until the wind pressure switch 17 is turned on, and the OFF time Tof the wind pressure switch 17 is a time from when commanding the blower 16 to turn off the wind pressure switch 17 until the wind pressure switch 17 is turned off. When abnormality occurs in a combustor 22, based on tendency of change in the stored On time Tand OFF time Tof the wind pressure switch 17, the combustion system is configured to estimate an abnormal place in the combustor 22.SELECTED DRAWING: Figure 1
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