Washer-dryer combo shows F15 and drying function is disabled.

Safety first: Unplug the appliance. Dryer components can be very hot; wait until fully cooled.

Step-by-step checks:

• Access dryer heater: On Whirlpool combos, the dryer heater is typically located in a heater box at the rear or side. Remove the rear panel to access.
• Inspect wiring and terminals: Look for burnt connectors or discolored wires at the heater, thermostats, and thermal fuse.
• Test thermal fuse and thermostats: With wires removed, check for continuity. Any open safety device must be replaced and the cause of overheating investigated (blocked airflow, etc.).
• Test dryer element: Measure resistance across the heater terminals. A typical dryer element is 8–20Ω depending on design. Replace if open or shorted to ground.

When to replace: Replace any failed safety device or heater. If all components test good but F15 persists, the heater relay or control board is likely defective and the main control board should be replaced.