To express that something is not working properly in standard conversational or professional English, you can use several clear phrases depending on the context. Common expressions include: 'It is malfunctioning,' 'It is acting up,' 'It is out of order,' 'It is not functioning correctly,' 'It is throwing an error,' 'It is experiencing technical difficulties,' 'It is on the fritz,' or simply 'It is broken.' These phrases clearly communicate that a device, appliance, or system requires troubleshooting and repair.
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