3iE Energy-Monitoring Thermostat

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Why does my thermostat trip every time it reaches the same temperature?

The thermostat tripping at the same temperature point could indicate that your system was cut during the time of installation. The resistance for your mat or cable is calculated on the length of the heater. Shortening the heater would increase the resistance and thereby the temperature. The cable is expected to operate fine at slightly higher temperatures for a time, but it may put undue strain on the end-splice, which may then fail.