How can I clean the filter of my Fagor washing machine model 1158?

I have a Fagor 1158 washing machine and it will not let the soapy water get out. Thus, it will not rinse nor spin because it's full of water inside. I already checked the filter located below and it's clean, also the hose that lets the water out and it's also clean. Where should I check for a blockage, or else, how do I know it's not a motor problem. Thank you.