Washer-dryer combo will not heat during wash or dry; display shows F07.

Safety first: Unplug the unit. Heating components can remain hot after use; allow time to cool.

• Access heater: Remove rear or bottom panel to locate the wash heater element and associated wiring.
• Inspect wiring: Check for burnt connectors, loose terminals, or damaged insulation. Repair or replace any compromised wiring.
• Check thermal cutoff/thermostats: Locate inline thermal fuses or thermostats on the heater housing. Test continuity with a multimeter; replace any open devices with JennAir-specified parts.
• Test heater element: Disconnect the heater leads and measure resistance across the element. An open circuit indicates a failed element that must be replaced.
• Reassemble and test: After replacing faulty components, run a hot wash or drying cycle and verify that water or air heats properly.

When to call a technician: If the heater and safety devices test good, the main control board heater relay may be defective and should be serviced by a professional.