Kenmore Dryer Error Code F4 E3 — Heater Relay Stuck On
What this means
The F4 E3 error code on Kenmore dryers indicates the control board has detected that the heater relay is stuck closed (on), causing the heating element to run continuously. This is a serious safety concern because the dryer cannot regulate temperature. The relay may be physically welded closed on the control board, or the board's relay driver circuit may have failed.
Alternate codes: F4E3
Step-by-step fix
3 stepsStop using the dryer immediately
Unplug the dryer from the wall outlet or turn off the circuit breaker immediately. A stuck heater relay can cause overheating and is a fire risk. Do not operate the dryer until this is repaired.
This is a safety-critical error — do not attempt to override or ignore it.
Test the heater relay on the control board
Access the control board (usually behind the top panel or console). With the dryer unplugged, locate the heater relay on the board. Test for continuity across the relay contacts — they should be open (no continuity) when the dryer is off. If they show continuity, the relay is welded shut.
The relay is typically the largest component on the board, often a blue or black rectangular block.
Replace the control board
A stuck relay requires replacing the entire control board. The relay is soldered to the board and is not field-replaceable separately. Photograph all connections, swap the old board for the new one, and reconnect.
Do not attempt to solder a new relay onto the board — the control board requires factory-calibrated components.
When to call a professional
Given the fire safety risk, professional repair is recommended unless you are experienced with appliance electronics.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
Links may earn us a commission at no extra cost to you. We only recommend parts relevant to this repair.