Does the HP OfficeJet Pro 6970 warranty cover damage caused by a continuous ink system?
No, HP's limited warranty is void if the printer is attached to an aftermarket apparatus or system that modifies the printer's functionality, such as a continuous ink system. The warranty only covers defects arising from normal use of the product. (Page 3)
From the official HP Officejet Pro 6970 All-in-One Printer manual, page 3
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