If the GFI trips, there is an electrical leakage path to ground; for the longer answer, read
GFCIs Fact Sheet, especially the warning excerpted below. If you are qualified, fixing the problem requires finding the cause of the leakage (the thread
Espresso machine trips GFI outlet offers some suggestions).
GFCIs Fact Sheet wrote:Here's how it may work in your house: Suppose a bare wire inside an appliance touches the metal case. The case is then charged with electricity. If you touch the appliance with one hand while the other hand is touching a grounded metal object, like a water faucet, you will receive a shock. If the appliance is plugged into an outlet protected by a GFCI, the power will be shut off before a fatal shock would occur.