Hotpoint Cooktop Error Code F18

F18 indicates a communication failure between the Visual Board's UART1 port and the External Board. These two boards exchange data continuously to coordinate control inputs and power output. When that communication link breaks down, the cooktop detects the fault and displays F18 to prevent unsafe operation. The cause can range from a loose connector to a failed circuit board.

No, you should not continue using the cooktop while F18 is active. A communication failure between the control boards means the appliance cannot reliably coordinate its control and power functions. Operating it in this state could result in unpredictable behavior. Turn the unit off and keep it off until the fault is diagnosed and resolved.

Repair costs depend on the root cause. If the issue is simply a loose connector, the repair may only involve a service call fee, typically in the range of $75 to $150. If a control board needs to be replaced, total costs including parts and labor generally fall in the range of $150 to $400 or more, depending on the specific board required and local labor rates. Getting a diagnostic quote before authorizing repairs is recommended.

A power cycle reset is the first recommended step and will sometimes clear F18 if the fault was caused by a temporary power disruption or software glitch. Turn the cooktop off at the breaker or unplug it, wait at least 3 minutes, then restore power. If F18 returns immediately, the underlying hardware issue, such as a damaged connector or failed board, must be addressed before the fault will clear permanently.

Start by powering the cooktop off and waiting 3 minutes before restoring power. If the error returns, the next step is to inspect the wiring harness and connectors between the Visual Board and the External Board for loose connections, damaged wires, or corroded terminals. If the wiring appears intact, one or both boards may need to be tested and potentially replaced. A qualified appliance technician can perform board-level diagnostics to identify which component is at fault.