An "Earth Fault" or "Ground Fault" light is a warning light on the fire alarm system saying "Somewhere in the building, electricity is leaking to the earth (ground)". The Earth Fault usually isn't in the box-on-the-wall called the fire alarm panel; the Earth Fault is usually on a wire connected to the fire alarm control panel.
Making a fault light disappear is like going around a "Road Closed" barrier, and then driving as fast as you can. You never know what is going to happen, but whatever happens is bad.
Do Not Disable a Fault Light or Cause It to Disappear.
This is a fire alarm system troubleshooting issue; you have to fix the fault, not turn off the warning light.
If you're not familiar with troubleshooting, get help.