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d-goods
Can you still hear the pump hum when you switch it to brew? You may just have loosened some scale which is clogging the flow.
Remove the shower screen which has one screw. Now remove the block which is held on with two allen screws. Then switch the pump on to see if you get flow. If you don't, you can give it a burst of high pressure by switching the thermostat to steam mode, and when it hits steam temp, throw the pump switch again. Beware that steaming hot water may blast out at this point if you did indeed have a blockage, and if it is cleared.