Electrolux / Frigidaire Dryer Error Codes E71 / E72: Outlet Thermistor Out of Range

Updated: February 2026

If your Electrolux or Frigidaire dryer displays E71 or E72 , the dryer is typically reporting that the outlet thermistor (exhaust temperature sensor) is reading out of range. The outlet thermistor is a key safety and control input. It helps the dryer regulate heat, prevent overheating, and determine whether temperatures are rising as expected during a heating cycle.

These codes are often caused by a failed thermistor, a wiring fault, or airflow problems that create temperature swings the control flags as abnormal. The goal of troubleshooting is to determine whether the sensor is electrically faulty, the harness is unreliable, or the dryer is experiencing airflow stress.

Symptoms you may see

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Dryer does not heat or heats weakly.
Cycle stops mid-run with an error.
Dry time becomes inconsistent from load to load.
Dryer feels unusually hot or shuts down to protect itself.

Safety steps

Disconnect power before opening panels.
Let the dryer cool before touching heater ducts, blower housings, and sensor mounts.
If you find melted wiring or scorched connectors, stop and call a professional.

Step 1: Start with airflow and venting

Airflow problems can cause abnormal exhaust temperature behavior and can also create genuine overheating conditions. Before testing sensors, do these checks:

Clean the lint screen and wash it if it has a slick film.
Inspect the vent hose for kinks, crushing, or lint clogs.
Confirm strong airflow at the exterior vent hood and that the flap opens fully.
If your vent run is long or exits through a roof, consider professional cleaning.

If airflow is weak, fix that first. A new thermistor will not solve an overheating and venting problem.

Step 2: Locate the outlet thermistor

The outlet thermistor is usually located on the exhaust duct or blower housing where it can measure exhaust air temperature. Access varies by model. Once you reach it, take a photo of wiring and connector orientation before removing anything.

Step 3: Inspect wiring and connectors

Many sensor-related errors are caused by poor connections. Look for:

Loose connectors that do not click or seat firmly.
Corrosion on pins or spade terminals.
Heat damage around the connector body.
Harness routing that allows rubbing against sharp metal edges.

Reseat connectors and repair any damaged terminals. If the harness insulation is rubbed through, repair or replace the harness to prevent intermittent opens.

Step 4: Test the thermistor electrically

With the dryer unplugged, disconnect the thermistor wires and measure resistance across the sensor terminals. Thermistors change resistance with temperature, so the exact reading depends on the sensor type and the current temperature. What you are looking for is basic electrical health:

An open reading (infinite resistance) indicates a failed sensor or a broken circuit.
A near-zero reading suggests a shorted sensor.
Unstable readings when you gently move the harness suggest a wiring fault.

If you can locate your model tech sheet, use its thermistor resistance chart for a definitive pass or fail at room temperature.

Step 5: Confirm the dryer is not overheating

If airflow is restricted, the outlet thermistor can see temperatures that rise too quickly, or remain high for too long, and the control may interpret that behavior as out of range. If your dryer feels excessively hot or trips safety devices, do not keep running it. Correct venting, clean internal lint if needed, and verify the blower wheel is moving air properly.

Step 6: If the thermistor tests good

If the thermistor resistance looks plausible and wiring is in good condition, the remaining suspects include:

Intermittent harness fault deeper in the cabinet.
Control board input issue misreading the sensor.
Misidentified sensor or connector (some platforms have multiple temperature sensors).

At this stage, a technician can perform connector pin tests at the control board and compare live temperature behavior in diagnostics mode, which can be faster than swapping parts.

After the repair: verify normal operation

Run timed dry with heat for 15 minutes and confirm stable warm exhaust and strong outdoor airflow.
Run an auto cycle and confirm it completes normally without errors.
Monitor the next few loads to confirm consistent dry times.

Keeping your venting clean is the best long-term prevention for E71/E72, because stable airflow supports stable temperature sensing.

Quick Recap: This guide covered everything essential about Electrolux / Frigidaire Dryer Error Codes E71 / E72: Outlet Thermistor Out of Range. Bookmark it for when you need a quick refresher on the key points.

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Frequently Asked Questions about Electrolux / Frigidaire Dryer Error Codes E71 / E72: Outlet Thermistor Out of Range

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