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Error code reference

Maytag Dryer Error Code F:20

No voltage detected at the heater relay (appears ONLY in Diagnostic Test Mode).

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No voltage detected at the heater relay (appears ONLY in Diagnostic Test Mode).

First step from the service manual

Check that the wires are plugged in on the heater element and at the relay on the electronic control.

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

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What F:20 means on a Maytag dryer

The F:20 error code on a Maytag dryer indicates that the electronic control board is detecting no voltage at the heater relay. This code only appears during the dryer's built-in Diagnostic Test Mode, not during normal operation. The heater relay is a component on the electronic control board that switches power to the heating element. When the control board commands the relay to energize and then checks for voltage at that relay output, a reading of zero volts triggers the F:20 code.

The most common cause is a simple wiring connection problem. The diagnostic sequence begins by inspecting the wire harness connectors at two specific points: the heater element itself and the heater relay terminal on the electronic control board. Connectors can back out, corrode, or become loose over time, especially in the heat-cycling environment inside a dryer cabinet. A disconnected or poorly seated connector at either location would interrupt the voltage signal the control board expects to see.

If the wiring connections are secure and the code persists, the fault likely points to a failed heater relay on the control board, a damaged wire harness with a break or short in the circuit between the relay and the heating element, or a faulty heating element assembly itself. Because the code is only generated during diagnostic testing, a technician must run the diagnostic mode deliberately to reproduce and confirm the fault before proceeding with component-level testing.

Source: manufacturer service documentation.

Common causes of F:20

  1. 01

    Loose or disconnected wire connector at the heater element

    Wiring / connection

    The wire harness connector at the heating element can work itself loose due to vibration and heat cycling. Inspect the connector and press it firmly into place, checking for any bent or corroded terminals.

  2. 02

    Loose or disconnected wire connector at the heater relay on the control board

    Wiring / connection

    The connector at the heater relay terminal on the electronic control board may not be fully seated. Unplug the dryer, locate the control board, and reseat the connector firmly.

  3. 03

    Failed heater relay on the electronic control board

    Part replacement

    If all wiring connections are secure, the relay on the control board itself may have failed and can no longer switch voltage to the heating circuit. A failed relay typically requires replacing the entire electronic control board.

  4. 04

    Damaged or broken wire harness

    Part replacement

    A wire in the harness between the control board and the heating element may be broken, shorted, or have damaged insulation. Visually inspect the harness for burn marks, pinched sections, or breaks, and use a multimeter to check for continuity.

  5. 05

    Failed heating element assembly

    Part replacement

    A burned-out or open heating element can affect the voltage reading the control board sees at the relay output. If wiring and the relay check out, test the heating element for continuity and replace it if it reads open.

See the test procedure for each cause

Frequently asked questions about F:20

What does F:20 mean on a Maytag dryer?
F:20 means the electronic control board detected no voltage at the heater relay during Diagnostic Test Mode. This code only appears when the dryer is running its built-in self-test, not during a regular drying cycle. It points to a problem in the circuit between the control board's heater relay and the heating element, most often a loose wire connection at one of those two points.
Can I fix the F:20 error code myself?
In many cases, yes. The first step is to unplug the dryer and check that the wire connectors are fully seated at the heating element and at the heater relay on the control board. If reseating the connectors clears the code during the next diagnostic test, no parts are needed. If the fault persists, further testing with a multimeter is required to identify whether the harness, heating element, or control board needs to be replaced.
Is it safe to use my dryer while the F:20 code is present?
Because F:20 only appears in Diagnostic Test Mode, you may not notice any performance issue during normal drying. However, the code indicates a fault in the heating circuit, which could mean the dryer is not heating efficiently or at all. It is best to diagnose and resolve the fault before continuing regular use to avoid incomplete drying cycles or further electrical issues.
How much does it cost to repair an F:20 error on a Maytag dryer?
If the fix is simply reseating a loose connector, there is no parts cost involved. If the heating element needs replacement, parts typically run in the range of $20 to $60 depending on the model. A replacement electronic control board is the most expensive possibility, generally ranging from $100 to $250 or more for parts alone, with additional labor costs if a technician performs the repair.
Will resetting the dryer clear the F:20 code?
A power reset, such as unplugging the dryer for a few minutes, may temporarily clear the code from the display. However, because F:20 is generated during Diagnostic Test Mode by an active voltage check, the code will return the next time diagnostics are run if the underlying wiring or component fault has not been corrected. A reset alone does not fix the problem.

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