User manual

PAGE 7

The thermostat has a built-in GFCI that ensures personal safety in case of ground

faults.

It is important that the GFCI is tested monthly. Installation and use must be

according to the national and local regulations.

Testing the GFCI

Press the test button on the top of the thermostat.

The test is successful if the red light in the test button lights up and a GFCI error text

is shown on the display. Press the power/reset button on the lower right side of the

thermostat to reset the GFCI.

The red light should go out and the display should return to normal appearance.

If this does not occur, contact your electrician.

If, during normal operation, the GFCI trips even though the test button was not

pressed, there could be a ground fault! To determine whether this was caused by a

ground fault or by nuisance tripping, press the power/reset button.

If this causes the red light in the test button to go o and stay o, it was nuisance

tripping and the system is operating correctly. If the red light remains on, there is a

ground fault! In this case, you should contact your electrician.

5. Ground Fault Circuit Interrupter (GFCI)

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