Warm Tiles Thermostat Gfci Tripping

After about a year in operation the built in gfci on the thermostat began tripping.

Warm tiles thermostat gfci tripping.

Gfci measure current in hot wire to heating mat and also measures the current in the neutral coming back. Thermostat to trip thermostat is in standby mode heating symbol flashing slowly wait for 3 minutes until heating icon stops flashing and is on continuously gfi flashing on lcd display ground fault detected by thermostat press reset button on thermostat if fault does not clear switch to off mode call service technician or contact easy. This is a very sensitive trip level required by ul. What causes thermostat to trip requiring reset button to be pressed.

The gfci in the 3ie and 4ie thermostats are class a which means below 5ma trip levels. I have a customer with a bathroom with the warm tiles heating system installed in one of his bathrooms. The imbalance when it trips is very small like 5 milliamps. There are several instances that could cause spurious tripping or nuisance tripping due to electrical noise on the circuit.

This will restore the warm tiles thermostat to the factory default settings. Likewise there are several instances that could cause spurious tripping or nuisance tripping due to electrical noise on the circuit. As a result ul requirements is a very sensitive this is a very sensitive trip level required by ul. Why the gfci is tripping the gfci in thermostats are class a which means below 5ma trip levels.

To reset the warm tiles thermostat to factory default settings turn off the circuit breaker in the electrical panel that supplies the warm tiles installation.