Sounds like the rubber filter bit that's on the bottom of the pump is blocked. Very common problem. Locate the washer bottle and remove the small water pump. It should just pull up and out. The rubber filter bit can be pulled out too. Bear in mind that water will flow from the bottle once the rubber bit is pulled out.
Flash the bottle through with hot water and all will be fine again once reassembled.
You just get a sediment build up in the bottom of the bottle which eventually blocks the filter.
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