Dryer will not heat; cycle runs but clothes stay cold and E04 appears on the display.

Safety first: Disconnect power before accessing the rear panel or heater assembly. Heating components can remain hot after use.

• Confirm no heat: Run a short cycle and check if any warmth is felt at the drum or exhaust. If completely cold, proceed with heater checks.
• Access heater assembly: Remove the rear panel (or front lower panel depending on model). Locate the heater housing on the air duct.
• Test thermal fuse and thermostats: With wires disconnected, use a multimeter to check continuity across the thermal fuse and high-limit thermostat. Replace any device that shows open circuit.
• Test heating element: Measure resistance across the heater terminals. An open circuit indicates a failed element. Replace the heater assembly if open or visibly damaged (burn marks, broken coil).
• Inspect wiring: Check for burnt connectors or loose spade terminals at the heater and thermostats. Repair or replace damaged connectors and ensure tight fit.
• Control board check: If all heater components test good, the heater relay or triac on the main control board may be faulty. Replacement of the control board is usually required.