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can anyone help,when i turn the hot tap on the water goes from hot to cold but lately now i notice when i turn the hot on the boiler doesn't start up so i get cold water,me central heating works fine and the boiler starts when i turn the heating on.can you help cause i've had loads of answers to...

how do i go about changing the flow meter in my boiler(optima 701)and is there a way to test it to see if its faulty or should i just change it.the problem is that when you turn hot water tap on the water goes hot and then cold,it does this often when you leave the hot tap running.thanx Brian