Washer-dryer combo does not heat water; display shows F07 during wash cycle.

Safety first: Unplug the unit. Heating components can retain heat; allow time to cool before touching.

Step-by-step checks:

• Access the heater: Remove rear panel to locate the water heating element mounted in the outer tub.
• Inspect wiring: Check heater terminals and wiring harness for burns, loose connections, or discoloration. Reseat connectors.
• Test the element: Disconnect wires and measure resistance across heater terminals. Typical Whirlpool washer heaters are 20–30Ω (check spec). If open (OL) or shorted to ground, replace the element.
• Check thermostats/thermal cut-offs: If present in series with the heater, test for continuity. Replace any open safety device and investigate cause of overheating.

When to replace: Replace the heating element or faulty thermostat as needed. If all components test good but F07 persists, the heater relay or control board is likely defective and the main control board should be replaced.