I can guide you through the exact repair steps for your specific appliance.
You need unhindered access to the bottom basin of the machine. how to drain dishwasher manually
Disconnect the hose under the sink. Point it into a bucket. If water flows out, the clog is after the hose (plumbing issue). If not, use a plumber’s snake or a straightened wire hanger to gently push out the clog. I can guide you through the exact repair