1. Waiting to report the problem
Write to the seller when you discover the problem. You must report it within a reasonable time, even if the usual two-year time limit has not expired.
Do this instead: Note the date you discovered the fault and send a short, clear message. You do not need to have everything perfectly prepared before telling the seller about the problem.
2. Not keeping a record of the agreement
A phone call can be useful, but it may be hard to remember or prove what was said.
Do this instead: Follow up in writing, for example: “Thank you for the call. As agreed, I will send …”. Keep the message with the rest of your documents.
3. Keeping evidence in different places
Receipts, photos and replies are more useful when you can find them again. A vague description of the fault can also make it harder to investigate.
Do this instead: Keep purchase details, photos, dates and records of earlier repairs together. Describe when and how the fault appears.
4. Assuming an expired guarantee settles everything
A commercial guarantee is a voluntary extra commitment. Your statutory rights come from the law and must be considered separately.
Do this instead: Check both the guarantee terms and the statutory rules. Ask whether the seller is rejecting your guarantee claim, your statutory claim or both.
Forbrug.dk on guarantees and statutory rights.
5. Not knowing why your claim was rejected
A rejection is easier to assess when the seller explains the reason. This does not mean every rejection is wrong.
Do this instead: Ask for a written reply, compare the explanation with the rules and check the relevant complaint route if you still disagree.
Read about taking a complaint further.