Important Wiring Information

This article applies to:    

Warning: The installation of high voltage equipment should be performed by a qualified electrician. Please ensure that you comply with local electrical codes and regulations. Improper installation can lead to device failure and even cause a fire. Damage to thermostat due to improper installation is not covered under warranty.

Installing a GFCI thermostat can be more complicated than installing a conventional thermostat. Make sure you have experience wiring circuits, understand basic wiring principles and techniques, and can interpret wiring diagrams. If you are unsure about anything related to wiring, please consult an electrician as high voltage systems are very dangerous. 

 Once completed, make sure you test the GFCI feature by pressing the 'Test' button on the side of Mysa. If everything is wired correctly the fault light should come on. Press the 'Reset' button to end the test.

 Line vs. Load

A cable consists of 2-3 wires (as pictured below)



Line Cable

Delivers power from the service panel (breaker panel or fuse box) to the thermostat. This cable should be connected to the thermostats Line terminals only.


Load Cable

Delivers power from the thermostat to the heater. This cable should be connected to the thermostats Load terminals only.

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