Using generic parts does not automatically void a washing machine warranty, but it can if the part causes damage, is not approved, or if the warranty terms require manufacturer-approved parts. In many places, a manufacturer also cannot force you to use only its branded parts unless it provides them for free or the law allows that requirement.
What usually matters
What matters most is whether the washer is still under warranty, whether the part was installed correctly, and whether the replacement part contributed to the failure. If a technician finds that a non-original part caused the problem, the warranty claim may be denied for that repair.
When generic parts are risky
Generic parts are most likely to create issues when they are used in critical components such as the motor, control board, heating element, pump, or sensors. Even if the washer runs for a while, a poor-quality or poorly matched part can create extra wear, electrical faults, or leaks that the manufacturer may refuse to cover.
When the warranty may still be valid
If the washer was repaired with a suitable generic part and the new part did not cause the failure, the rest of the warranty may still remain valid. In practice, the manufacturer usually looks at the specific fault and whether the appliance was modified in a way that affected performance.
Safe rule to follow
If the washer is under warranty, check the warranty terms before replacing anything.
Use OEM or approved parts for major components if you want the least risk.
Keep receipts and service records.
If possible, use an authorized technician for warranty-covered machines.
The short answer is: generic parts can sometimes be used, but they are not risk-free. If the machine is still under warranty, the safest choice is to confirm the rules first so you do not lose coverage accidentally.