Amana Dryer F3 E1: Exhaust Thermistor Open Circuit

F3 E1 means the exhaust temperature sensor reads infinite resistance — the circuit is broken. The control board expects a reading between 5,000-100,000 ohms from this NTC thermistor. An open reading means the sensor element has fractured, the wiring is broken, or the connector is separated.

What the Exhaust Thermistor Does on Amana Dryers

The exhaust thermistor sits in the exhaust duct housing downstream of the lint screen. It monitors the temperature of air leaving the drum. The board uses this reading to control the heating element cycling and the cool-down phase timing.

Amana dryers rely solely on this one exhaust thermistor for temperature feedback (unlike premium brands that add an inlet sensor for differential measurement). This makes the exhaust thermistor a single point of failure — when it goes, the board has zero temperature information.

Locating the Sensor

Electric Amana dryers: Remove the rear panel (4-6 screws). The exhaust thermistor is a small oval or cylindrical component on the blower housing or exhaust duct. Two wire leads connect to the harness. Do not confuse with the cycling thermostat (larger, round with snap-in terminals) or the high-limit thermostat (round, on the heater housing) or the thermal fuse (smaller, oval, near the blower housing).

Gas Amana dryers: Same general location but may require removing the lower front panel for access. The thermistor sits closer to the burner exhaust path.

Testing Procedure

1. Unplug the dryer or turn off the 30A breaker.
2. Locate and disconnect the exhaust thermistor's two-wire connector.
3. Set multimeter to 20K ohm range.
4. Measure across the two thermistor leads:
   • At room temperature (72 degrees F): expect 10,000-11,500 ohms
   • After a recent cycle (warm): expect 6,000-7,000 ohms
   • Open (infinite/OL on display): confirmed failure — F3 E1 cause located
   • Near 0 ohms: different code (F3 E2 is the shorted version) — also replace

Why F3 E1 Is Dangerous

When the exhaust sensor reads open, some Amana models default to continuous heating (the board cannot confirm that the target temperature was reached, so it keeps the element on). This can overheat clothes, damage drum seals, and create fire conditions — especially if the vent is also restricted.

Other Amana models default to no heating (safer but the dryer does not dry clothes).

Neither behavior is acceptable. Replace the thermistor promptly.

Replacement

1. Unplug. Remove the appropriate panel.
2. Locate the thermistor on the blower housing or exhaust duct.
3. Note wire colors. Disconnect the connector.
4. Remove the one mounting screw.
5. Install the new thermistor (WP8577274, $8-15). Secure. Reconnect.
6. Reassemble. Restore power. Run a 10-minute timed dry cycle — verify warm exhaust air at the exterior vent.

Related Components to Inspect

While the panel is open:

• Cycling thermostat: Test for 0 ohms at room temperature. Replace if open (WP3387134, $6-12).
• High-limit thermostat: Test for 0 ohms at room temperature. One-shot device — once tripped, replace (WP3977767, $6-10).
• Thermal fuse: Test for continuity. Open = blown, dryer will not heat (WP3392519, $4-8).

These are cheap components. Replacing all four thermal safety devices at once during a service call is cost-effective preventive maintenance ($25-45 total parts).

Cost

Exhaust thermistor: $8-15 DIY, $80-140 professional. This is among the cheapest dryer repairs. The part itself costs less than most diagnostic service calls.

Amana vs. Maytag Part Compatibility

Amana and Maytag dryers on the same Whirlpool platform use identical thermistors (same part number WP8577274). If your local store has the Maytag part in stock but not the Amana-labeled version, they are interchangeable.

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Amana dryer not heating with F3 E1? Thermistor replacement is a quick, affordable fix. Book today.