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Error code reference

Moffat Dryer Error Code F1

Improper operation of the temperature sensor

Moffat codesMoffat dryer codes

Improper operation of the temperature sensor — sensor circuit open or short circuit; program finishes immediately.

First step from the service manual

Check the connection with the temperature sensor for open or short circuit.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F1 means on a Moffat dryer

The F1 error code on a Moffat dryer indicates a fault in the temperature sensor circuit. Specifically, the control board has detected either an open circuit or a short circuit in the wiring or sensor element responsible for monitoring drum temperature. Because the dryer relies on accurate temperature readings to regulate the heating cycle, a compromised sensor circuit causes the control board to abort the program immediately rather than risk overheating or running without proper thermal regulation.

The temperature sensor is a thermistor-type component whose electrical resistance changes in proportion to temperature. When the control board reads a resistance value that falls outside the expected range, either impossibly high due to an open circuit or near zero due to a short, it interprets this as improper sensor operation and triggers the F1 fault. Common failure points include the sensor element itself, the wiring harness connecting the sensor to the control board, and the connector terminals at either end of that harness.

Diagnosis begins at the physical connection between the temperature sensor and the control board harness. Loose, corroded, or damaged connector pins can introduce enough resistance to simulate an open circuit, or cause intermittent shorts. If the connections check out, the sensor element itself should be tested for correct resistance values across its operating temperature range. A failed sensor that reads open or shorted at room temperature will need to be replaced before the dryer can complete a drying cycle.

Source: manufacturer service documentation.

Common causes of F1

  1. 01

    Loose or disconnected sensor connector

    Wiring / connection

    The wiring harness connector at the temperature sensor or control board may have worked loose, creating an open circuit. Inspect both ends of the connector for proper seating and listen for an audible click when pressing them together.

  2. 02

    Failed temperature sensor

    Part replacement

    The thermistor element inside the sensor can fail open or short internally, producing an out-of-range resistance reading. A failed sensor will typically read infinite resistance or near zero ohms when tested with a multimeter at room temperature.

  3. 03

    Damaged wiring harness

    Part replacement

    Wires running to the temperature sensor can become pinched, chafed, or broken, particularly near harness routing points and sharp cabinet edges. Visually inspect the full length of the sensor wiring for cuts, melted insulation, or broken conductors.

  4. 04

    Corroded or damaged connector terminals

    Wiring / connection

    Moisture or heat exposure can corrode the terminal pins inside the sensor connector, increasing resistance enough to trigger an open circuit fault. Check terminals for discoloration, pitting, or carbon tracking and clean or replace as needed.

  5. 05

    Faulty control board

    Part replacement

    If the sensor and all wiring test within spec but the F1 code persists, the control board input circuit for the sensor signal may be defective. This is the least common cause and should only be considered after all other components have been ruled out.

See the test procedure for each cause

Frequently asked questions about F1

What does F1 mean on a Moffat dryer?
F1 on a Moffat dryer means the control board has detected improper operation of the temperature sensor, specifically an open circuit or short circuit in the sensor wiring or the sensor element itself. Because the dryer cannot confirm safe operating temperatures, it terminates the program immediately. The fault must be resolved before a drying cycle can be completed.
Can I fix the F1 error on my Moffat dryer myself?
In many cases, yes. Start by unplugging the dryer and inspecting the temperature sensor connector for loose, corroded, or damaged terminals, then reseat the connection firmly. If the connector is intact, testing the sensor with a multimeter and replacing it if it reads open or shorted is a straightforward repair for someone comfortable with basic appliance disassembly. If the wiring harness is damaged, splicing or replacing that section may also be within DIY range.
Is it safe to keep using my Moffat dryer with an F1 error?
No. The F1 error means the dryer has no reliable way to monitor drum temperature, so running it could pose an overheating or fire risk. The control board does shut the cycle down immediately when the fault is detected, but the underlying wiring or sensor issue should be corrected before operating the dryer again.
Will resetting my Moffat dryer clear the F1 error?
A power reset by unplugging the dryer for a few minutes may temporarily clear the fault code, but if the sensor or wiring fault is still present, the F1 error will return as soon as the control board attempts to read the sensor again. A reset alone is not a repair, and the underlying cause must be diagnosed and corrected for the error to stay cleared.
How much does it cost to repair an F1 error on a Moffat dryer?
If only a connector needs reseating or cleaning, there may be no parts cost at all, with any expense limited to a service call if you hire a technician. A replacement temperature sensor typically runs in the range of $15 to $50 for the part. If the control board is the root cause, board replacement costs generally range from $80 to $200 or more depending on the specific model and parts availability.

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