I recently installed a new sink in the upstairs main bathroom, a friend of mine helped me out as im know nothing about plumbing, i turned off the main supply to the house, and let the tap from the sink to be replaced drain the tank in the attic.
We installed the sink, fitted the tap and turned the mains supply back on, but since that, we have no cold water to any of the upstairs taps, and the toliets are not filling back up with water, the main kitchen sink has cold water.
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