4. The customer has to inspect the goods immediately after delivery, even if samples have been provided beforehand, and immediately notify us in writing of any defects or deviations in quantity detected. Otherwise, the goods shall be deemed approved, unless they are defects that were not identifiable during the inspection. The customer must notify us in writing of any hidden defects immediately after discovery of the defect.
5. We have the opportunity to determine the indicated deficiency. In urgent cases of endangerment of operational safety or to prevent disproportionately large damage of the customer, we have to determine the indicated defect immediately. Complained goods must be returned to us immediately upon request. If the customer does not comply with these obligations or makes changes to the goods that have already been complained about without our consent, he loses any rights due to material defects.
6. If we fail to meet our warranty obligations or fail to do so within a reasonable period of time or if the repair remains unsuccessful at first, the customer may set a deadline in writing within which we must fulfill our obligations. Setting a deadline is not necessary if it would be unreasonable for the customer. After unsuccessful expiration of this period, the customer may request a reduction of the price, withdraw from the contract or have the necessary rectification itself or by a third party at our expense and risk. If the repair has been carried out successfully by the customer or a third party, all claims of the customer are settled with reimbursement of the necessary costs reimbursed to him.
7. We assume the costs incurred for the purpose of repair (in particular transport, travel, labor and material costs). Insofar as the expenses increase as a result of the items being transported to a place other than the place of delivery of the customer after delivery, the latter bears the additional costs, unless the transfer corresponds to the intended use. Insofar as we rectify the defect due to a defect, the customer must immediately enable the execution of the work and provide us with the rejected goods for inspection and processing.
8. The costs incurred by any unjustified complaints shall be borne by the customer. These are billed according to expenditure.
9. In the event of failure of the repair or replacement, the customer is entitled, without prejudice to any claims for damages, to demand a reduction of the remuneration or to withdraw from the contract.
10. Claims for defects do not exist in case of insignificant deviation from the agreed condition and only insignificant impairment of usability.
11. Further claims of the customer are excluded in accordance with the provision of retention of title.
12. The proof of a defect is incumbent on the customer.