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QuestionAnswer

Why can I not switch on the lamp again immediately after I switched it off?

Why do I hear no sound when the alarm goes off?

Why does the radio (HF3462, HF3461 only) not work?

Why does the radio (HF3462, HF3461 only) produce a crackling sound?

The alarm went off yesterday. Why did it not go off today?

Why does the light wake me too early/too late?

Perhaps you switched off the alarm function by pressing the ALARM button.

Perhaps the lamp is defective. Replace the lamp (see chapter ‘Replacement’).

You have to wait 3 seconds for the lamp to dim. During this time, the 3 button does not work.

Perhaps you set the sound level too low.Turn the volume control to a higher sound level.

Perhaps you switched off the alarm function by pressing the ALARM button.

If you selected the radio as alarm sound (HF3462/HF3461 only), the radio may be defective. Press the radio button after you switch off the alarm to check if the radio works. If it does not work, contact the Philips Customer Care Centre in your country.

The radio function is probably defective. Contact the Philips Customer Care Centre in your country.

Connect the external antenna if you have not yet connected it. See section ‘Radio’ in chapter ‘Using the appliance’.

Perhaps the broadcast signal is weak. Search for the correct signal (see chapter ‘Using the appliance’).

Perhaps you switched off the alarm function by pressing the ALARM button. Set the alarm for the next day and switch off the wake-up alarm sound and light the next day by pressing the 3 button (see chapter ‘Using the appliance’).

Perhaps you set the sound and/or light level to a too low setting. Set a higher sound and/or light level.

Perhaps there has been a power failure that outlasted the capacity of the backup system. After a long power failure, the display shows an incorrect clock time and the alarm time is 00.00. Set the correct clock time (see chapter ‘Preparing for use’) and the correct alarm time (see chapter ‘Using the appliance’).

Perhaps the light level you have set is not appropriate for you.Try a lower light level if you wake up too early or a higher light level if you wake up too late. For most people, the light is effective at settings 9-20 (HF3451) or 7-15 (HF3462/HF3461).

Perhaps you woke up too late because the appliance is at a lower level than your head. Make sure the appliance is located at such a height that the light is not blocked by your bed, duvet or pillow.

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Philips HF3451 manual QuestionAnswer
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HF3451 specifications

The Philips HF3451 is an innovative wake-up light designed to enhance the waking experience by simulating a natural sunrise. This product stands out in the market for its ability to mimic the gradual increase in daylight, helping users to wake up more gently and naturally.

One of the key features of the HF3451 is its ability to gradually increase the light intensity over a period of 20 to 40 minutes before the alarm time is set. This progressive light increase simulates the experience of a natural sunrise, easing people out of sleep and reducing the jarring effects of a traditional alarm clock.

In addition to its natural wakes-up feature, the HF3451 also offers a variety of sound options. Users can choose from different nature sounds, such as birds chirping or gentle streams, to accompany the light, providing a more serene waking environment. Furthermore, there's an FM radio feature that allows users to wake up to their favorite radio station, adding an extra layer of personalization to the waking experience.

The design of the Philips HF3451 is sleek and modern, fitting seamlessly into various bedroom aesthetics. It features a large, easy-to-read display that provides clear visibility even in low light. The adjustable brightness of the display ensures it does not disturb your sleep while maintaining a functional aspect.

Durability and energy efficiency are also important characteristics of the HF3451. The light utilizes LED technology, which is known for its long lifespan and lower energy consumption. This makes it not only environmentally friendly but also cost-effective over time.

Moreover, the HF3451 includes a snooze function that allows users to enjoy a few extra minutes of rest before the light and sound resume. Its intuitive design makes it user-friendly, with touch-sensitive buttons positioned for easy access.

Overall, the Philips HF3451 combines advanced technology with user-centric features to create a unique and beneficial waking experience. By seamlessly integrating light therapy and sound to enhance the waking process, it caters to those looking to improve their morning routine and overall well-being.
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