Drain pump constantly running and no hot water enters DW?

Hot water will not come into dishwasher. Drain pump runs constantly no matter what cycle the timer is in. Problem started with plugged sink. Wife used plunger in the sink and subsequently noticed dirty water leaking around door seal of dishwasher. Opened door and tub full of dirty water. Later when tried to wash dishes, the before mentioned symptoms appeared. Bosh dishwasher model no. SHU66C06 built-in.

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Thanks cw for the reply.

I pulled the DW out, tipped it fully on it's back and maybe a quart of water ran out the base. Re-installed and problem still exists. I also tapped on the water inlet valve in case it might be stuck and still no joy. Any other ideas I cold try? Thanks again.