On a Frigidaire dryer, E4A is most consistently reported as an open exhaust thermistor — the control board loses its reading of exhaust temperature and locks out heat, which is why E4A commonly shows up as a no-heat complaint. E5C is a motor stall — the drive motor bogs down and stops mid-cycle. Both point away from a simple filter or vent fix and toward a specific sensor or motor circuit.
E4A — exhaust thermistor fault
The exhaust thermistor reports duct-air temperature back to the control board. If that circuit opens — a failed thermistor or a damaged wire — the board can no longer verify exhaust temperature safely and disables heat, which is why owners most often notice E4A as the dryer running with no heat rather than as an isolated code.
| Cause | How likely | What to look for |
|---|---|---|
| Failed or open exhaust thermistor | Common | No heat, code appears early in the cycle |
| Damaged or loose thermistor wiring | Common | Intermittent E4A, worse after the dryer is moved |
| Extended dry time from a restricted vent | Occasional | Long cycles before the code appears |
E5C — motor stall
E5C means the drive motor has bogged down and stopped partway through a cycle rather than run smoothly to completion.
| Cause | How likely | What to look for |
|---|---|---|
| Overpacked drum | Common | Heavy or bulky load straining the motor |
| Belt caught or slipping on the motor shaft | Common | Unusual noise before the stall |
| Failing drive motor | Less common | E5C recurs on normal-sized loads with a clear belt |
How to fix it
- For E4A, check the vent first
Clear the lint filter and vent hose — a restricted vent that extends dry times can contribute to the fault showing up. This will not fix a genuinely failed thermistor, but it rules out the easiest cause first.
- Inspect thermistor wiring
With the machine unplugged, check the wiring to the exhaust thermistor for damage or a loose connector, particularly if the dryer has recently been moved.
- For E5C, reduce the load
Run a smaller, more typical load and listen for unusual noise from the motor or belt area before it stalls.
- Confirm incoming power
If E5C recurs regardless of load size, have the power company or an electrician confirm the voltage and frequency reaching the dryer are correct before assuming a part has failed.
When to call a professional
If E4A persists after checking the vent, have a technician test and, if needed, replace the exhaust thermistor. If E5C persists with a normal load, confirmed power supply and no obstruction, the drive motor or the speed control board has likely failed and needs professional replacement.
Stop and call a qualified appliance technician or electrician if you find scorched or melted wiring, smell burning, see water that has reached electrical components, or if the fault returns immediately after a repair. Never bypass a safety device — thermal fuses, door interlocks and flood switches fail for a reason, and defeating one converts a broken appliance into a fire or flood risk.
