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If the tap switches the pump on then which it appears to do as you can hear it ok then May be an air lock or the pump has become dislodged from its usual place in the tank corner and may be sitting out of the water or become detached from the connecting pipe to the tap.
I know this sounds difficult but disconnect the tap electrical connection under the sink, open the tap and blow hard down the tap outlet. If the pump is sitting in the water and connected you should hear air bubbling into the tank and there will be some resistance to your blowing.
Reconnect the electrical connection and the pump should prime and start pumping.
If there is no resistance when you blow then the pump is either out of the water or the pump has come off the connecting pipe inside the tank.
This may fit with your observation that you think the pump is just circulating water in the tank
The access hatch for the tank is in the wardrobe .
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HI had this problem long weekend. I top-up water and start kitchen tab but water doesn't come even no pump sound. So i start investigation step by step. 1: First Check Fuse is fine or not. use multimeter continuity test. i found fuse was blown.
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correct placement of pump in tank and white connection pipe.
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