GE Refrigerator Error Code F504

F504 means the hot water tank could not fill to the required level before the fill time limit expired. The control board monitors a float switch inside the tank to confirm a successful fill. When that switch does not trip within the allowed time, the board stops the fill cycle and displays F504. This protects the system from running the hot water components in a low-water or no-water condition.

The F504 code is itself a protective response rather than a dangerous failure. The control board stops the fill cycle specifically to prevent the hot water system from operating without adequate water, which could damage heating components. You should address the underlying cause promptly, but the code indicates the safety logic is working as intended.

A power reset may temporarily clear the F504 code, but if the underlying problem is not corrected, the code will return the next time the refrigerator attempts to fill the hot water tank. A reset is useful for confirming whether the fault is intermittent, but it is not a substitute for diagnosing and correcting the actual cause. Address the water supply, inlet valve, and float switch before relying on a reset to resolve the issue.

Some causes of F504 are straightforward DIY fixes, such as opening a closed isolation valve, clearing a kinked supply line, or cleaning a clogged inlet valve screen. If those checks do not resolve the code, testing the hot water inlet valve solenoid and float switch requires a multimeter and some comfort working inside the appliance. If you are not confident testing electrical components, a qualified technician should handle the repair.

If the fix is as simple as opening a valve or replacing a supply line, costs are minimal, typically in the range of $10 to $40 for parts. A replacement hot water inlet valve generally runs $30 to $80 in parts. A float switch replacement can range from $20 to $60. Adding professional labor, a service call typically costs $100 to $200 depending on your area, with total repair costs ranging from $150 to $350 if parts and labor are both required.