If you clear the filter, reassemble the machine, and it still won't drain, the problem is likely deeper. You may have a failed drain pump (the motor has burnt out) or a blocked internal drain hose that requires dismantling the machine's chassis. At that point, a service technician is required.
To prevent a blocked filter in the future: blocked filter washing machine
If the machine just finished a hot cycle, wait at least an hour for the water to cool to avoid burns. Step 1: Preparation If you clear the filter, reassemble the machine,