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Error code reference

Whirlpool Microwave Error Code ERR 3

Key error when one of the buttons is pressed longer than 1 minute.

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Key error when one of the buttons is pressed longer than 1 minute.

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What ERR 3 means on a Whirlpool microwave

ERR 3 on a Whirlpool microwave indicates a key error condition, specifically triggered when one or more buttons on the control panel have been detected as continuously active for longer than 60 seconds. The control board monitors each key input and expects button presses to be brief, discrete signals. When a key input remains in a closed or active state for more than one minute, the control board interprets this as an abnormal condition and halts operation by displaying ERR 3 to prevent unintended microwave activation.

The primary system involved is the membrane touchpad and its interface with the main control board. The touchpad contains a matrix of conductive traces that complete a circuit when a button is pressed. If a key becomes physically stuck, if moisture or debris bridges the contacts beneath the membrane, or if the membrane itself degrades and causes a short in the keypad circuit, the control board will see a persistent signal from that key. This sustained signal is what trips the ERR 3 condition.

Common contributing factors include physical damage to the membrane touchpad from impacts or excessive cleaning, liquid infiltration behind the control panel, and delamination or warping of the membrane layers that causes internal contact. In some cases, the ribbon cable connecting the touchpad to the control board can develop a fault that mimics a stuck key signal. Rarely, the control board itself may misread key inputs due to a component failure on the input processing circuit.

Source: manufacturer service documentation.

Common causes of ERR 3

  1. 01

    Stuck or physically jammed button

    Part replacement

    A button on the touchpad may be physically depressed and unable to spring back to its resting position, keeping that key circuit closed. Inspect the control panel surface for any keys that appear sunken, misaligned, or do not have normal tactile response.

  2. 02

    Moisture or debris under the membrane touchpad

    Part replacement

    Liquid spills or cleaning product residue that seeps behind the membrane can bridge the conductive contacts and simulate a continuous key press. Look for discoloration, bubbling, or soft spots on the touchpad surface as indicators.

  3. 03

    Damaged or delaminated membrane touchpad

    Part replacement

    Over time, the membrane layers can separate, warp, or develop internal shorts that keep a key circuit active without any physical pressure applied. This type of failure typically requires replacing the entire touchpad assembly.

  4. 04

    Faulty ribbon cable connection

    Part replacement

    The ribbon cable linking the touchpad to the control board can develop a short, loose connection, or damage that causes the control board to read a key as continuously pressed. Inspecting and reseating or replacing the ribbon cable may resolve this.

  5. 05

    Control board input circuit failure

    Part replacement

    In less common cases, a component on the main control board responsible for reading key inputs may fail and produce a false continuous key signal. This is typically diagnosed only after ruling out all touchpad and cable related causes.

See the test procedure for each cause

Frequently asked questions about ERR 3

What does ERR 3 mean on a Whirlpool microwave?
ERR 3 means the microwave detected a key error where one of the control panel buttons was registered as continuously active for more than 60 seconds. This is outside normal operation, so the control board stops the microwave and displays the error code. The most common causes are a physically stuck button, moisture under the membrane touchpad, or a damaged keypad. The microwave will not operate normally until the underlying key fault is resolved.
Can I fix ERR 3 on my Whirlpool microwave myself?
In some cases, yes. Start by unplugging the microwave for a few minutes and then pressing each button firmly to try to free any stuck key. If moisture is suspected, allow the unit to dry completely in a well-ventilated area before restoring power. If the error returns after these steps, replacing the membrane touchpad is typically the next repair step, which is a task many experienced DIYers can perform. Control board replacement is more complex and may warrant a professional technician.
Will resetting the microwave clear the ERR 3 code?
Unplugging the microwave and restoring power may temporarily clear the display, but ERR 3 will return if the underlying cause, such as a stuck button or damaged touchpad, is not corrected. A reset does not repair a faulty key input circuit. If the code reappears immediately or shortly after a reset, the touchpad or its connections need to be inspected and serviced.
Is it safe to use a Whirlpool microwave displaying ERR 3?
You should not attempt to use the microwave while ERR 3 is active. The error indicates an abnormal key input condition, and the control board has halted operation specifically to prevent unintended activation. Continuing to operate an appliance in this fault state could pose a risk of the microwave starting unexpectedly. Unplug the unit until the fault is properly diagnosed and repaired.
How much does it cost to repair an ERR 3 error on a Whirlpool microwave?
Repair costs vary depending on the faulty component. A replacement membrane touchpad or keypad assembly typically costs between $20 and $80 for the part alone, depending on the model. If professional labor is required, total repair costs including diagnosis and installation can range from $100 to $250. Control board replacement, if needed, is generally more expensive and may approach or exceed the cost of a replacement microwave in some cases.

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