Treatment system

A treatment system comprising:

• a holding section that has a heat generation section for applying thermal energy and holds a living tissue;
• a signal output section that supplies a drive signal to the heat generation section;
• a setting section that sets a target temperature of the heat generation section;
• a signal detection section that detects the drive signal;
• a signal extraction section that extracts an extracted signal of a predetermined frequency band from the drive signal detected by the signal detection section;
• a fault detection section that detects a precursory phenomenon of a fault of the heat generation section when the extracted signal reaches or exceeds a predetermined threshold;
• and
• a control section that controls the drive signal supplied from the signal output section to the heat generation section in either one of a treatment mode for treating the living tissue at the target temperature or of a test mode for detecting the precursory phenomenon.