I purchased a Sennheiser 450BT headphone in October 2024, and I’ve already run into multiple issues. First, there was a problem where no sound was coming from the device, although that seemed to fix itself over time. Now, the ear pad has completely fallen off, and the build quality has become a serious concern for me.
I want to send the product in for service, but there’s a major obstacle—I can’t locate the warranty certificate. I bought the headphones through a third-party seller on Trendyol, and while I’m sure the product is 100% original, I can’t find any documentation to support a warranty claim.
On top of that, I don’t know where to find the serial number on the device, which is apparently needed for service requests. This has made the entire process stressful and frustrating.
I’m requesting that Sennheiser support guide me clearly on how to proceed with sending in my product for repair or replacement. Please let me know how to verify the serial number and whether purchase proof from Trendyol is enough for warranty support. I genuinely like the brand, but this experience has shaken my confidence. I expect a prompt and helpful response.
My Sennheiser 450BT headphones no longer produce sound from the right side. I got this product as a gift from a shopping center in another country around 4-5 months ago, and I started using it. Sorry, I threw away the box and everything that came with it. When I reached out to Bircom, they told me t...
I purchased my Sennheiser Momentum 4 headphones on February 18, 2024, from the MediaMarkt store at İzmir Optimum Mall. The product is still under warranty, and I have both the invoice and the previous service request records. About a month ago, I noticed fabric deformation on several parts of the h...
When I tried to use my Sennheiser Momentum True 4 headphones on September 23, 2025, I noticed that the device wouldn't connect at all and there was no sound. Since the problem began, the headphones have been completely inoperable. I tried resetting the headphones and charging them for a long time to...
I’ve been experiencing Bluetooth connectivity problems with my Sennheiser HD 450BT headphones for the past 3–4 months. The headphones no longer connect to my phone, and the dual-device pairing feature has never worked. The Bluetooth reset function also doesn’t respond — pressing the buttons has no e...
For about two months, I’ve been experiencing Bluetooth connection problems with my Sennheiser HD 450BT headphones. At first, the issue was occasional, but now the headphones won’t connect to any device at all. I’ve tried pairing with multiple phones and computers, but it makes no difference. I also ...
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