Dishwasher displays F7; may not heat or may shut down during drying.

Safety first: Turn off power at the breaker and allow the unit to cool completely.

• Inspect the heater: Remove the lower rack and visually inspect the exposed heating element for breaks, blisters, or burn marks.
• Test heater continuity: Access the heater terminals from underneath. Disconnect the wires and measure resistance with a multimeter. An open circuit indicates a failed element that must be replaced.
• Check the high-limit thermostat: Locate the thermostat (often mounted on the tub or heater housing). Test for continuity; if open at room temperature, replace it.
• Inspect wiring: Look for burned or loose connections at the heater and thermostat. Repair or replace damaged wiring using proper high-temperature connectors.

If the heater circuit tests good, the control board’s heater relay may be defective and require replacement.