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Error code reference

Whirlpool Microwave Error Code Flashing colon ":"

Power failure indication.

Whirlpool codesWhirlpool microwave codes

Power failure indication.

First step from the service manual

Press any key to end the flashing colon indication; the colon will then be steady when in standby.

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

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What Flashing colon ":" means on a Whirlpool microwave

A flashing colon on a Whirlpool microwave display is a power failure indication. This occurs when the microwave loses and then regains AC power, causing the clock and control board to reset. The colon between the hour and minute digits flashes specifically to alert the user that the internal clock has lost its time reference and that stored time settings are no longer valid.

The control board continuously monitors its power supply. When an interruption occurs, whether from a tripped breaker, a brief utility outage, or the unit being unplugged, the volatile memory holding the clock time is cleared. Upon power restoration, the board enters a standby alert state and signals this condition by flashing the colon instead of displaying a steady time readout.

This is not a fault code related to component failure. No cooking functions, sensors, or internal components are implicated. The display behavior is purely a notification that the clock needs to be reset. Pressing any key on the control panel clears the flashing indication and returns the display to a steady colon in standby mode, after which the user can set the clock normally.

Source: manufacturer service documentation.

Common causes of Flashing colon ":"

  1. 01

    Brief power outage

    Wiring / connection

    Even a momentary interruption in household power will cause the microwave to lose its clock settings and display the flashing colon upon restoration. Check if other clocks or devices in your home also reset.

  2. 02

    Microwave unplugged or outlet switched off

    Wiring / connection

    If the microwave was intentionally or accidentally unplugged, or if its outlet was switched off at a power strip or wall switch, the control board will lose power and trigger the flashing colon when reconnected.

  3. 03

    Tripped circuit breaker

    Wiring / connection

    A tripped breaker on the kitchen or dedicated appliance circuit will cut power to the microwave. After the breaker is reset and power is restored, the flashing colon will appear.

  4. 04

    Loose or intermittent outlet connection

    Wiring / connection

    A loose plug connection or a failing wall outlet can cause repeated momentary power losses, leading to recurring flashing colon indications. Test the outlet with another device to confirm it is delivering consistent power.

See the test procedure for each cause

Frequently asked questions about Flashing colon ":"

What does Flashing colon ":" mean on a Whirlpool microwave?
A flashing colon on a Whirlpool microwave is a power failure indication. It means the unit lost power at some point and the clock has been cleared. The microwave is functioning normally and is simply alerting you to reset the time. Press any key to stop the flashing and return the display to steady standby mode.
How do I fix the flashing colon on my Whirlpool microwave?
Press any key on the control panel to clear the flashing colon indication. The display will then show a steady colon, indicating the microwave is in standby mode. From there, you can use the clock set function to re-enter the correct time. No repair or part replacement is needed.
Is a flashing colon on a Whirlpool microwave a safety concern?
No, a flashing colon is not a safety concern. It is only a notification that the clock lost power and needs to be reset. All cooking and safety functions of the microwave remain fully operational. You can continue using the microwave normally after pressing any key to clear the indication.
Will resetting the microwave clear the flashing colon?
Yes, pressing any key on the control panel will immediately end the flashing colon and return the display to a steady standby state. You do not need to unplug the unit or perform a hard reset. Simply pressing a single button is the complete resolution for this indication.
How much does it cost to fix a flashing colon error on a Whirlpool microwave?
There is no cost involved in resolving a flashing colon indication, as it is not caused by a component failure. It requires only pressing a key on the control panel to clear it, followed by resetting the clock. If the flashing colon appears repeatedly and frequently, investigating the wall outlet or household circuit for power instability may be worthwhile, but no parts or service calls are needed for the indication itself.

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