If handpiece light guide stop cooling?

Handle crystal cooling consists of peltier module, wiring and 12v switching power supply.
If your hand piece stop cooling, you can check these 3 parts :
1, Peltier module:
http://www.ipl-elight-shr.com/c/peltier-module_0129
2, 12v switching power supply:
http://www.ipl-elight-shr.com/switching-power-supply-nes-200-12_p0171.html

3, Wiring like the dotted lines in the picture.

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