All products come with an 18-month warranty from the factory date. Non-artificial failures within the warranty period are repaired or replaced free of charge.
Phone: +86 135 9023 3250 (weekdays 9:00-18:00); Email: caisen@hfydrive.com (please attach proof of purchase and photos/videos of the failure); or submit via the "Online Inquiry" form in the sidebar.
Confirm failure → Remote diagnosis (phone/video) → RMA form if factory return needed → Testing & repair → Ship back.
Unauthorized disassembly, burnout caused by wrong wiring, water corrosion, or operation beyond rated parameters can be repaired at a reasonable charge.
