Help needed, I know its old and may need replacing but was working perfect until water board put new pipes down the street (lot higher water pressure now had to renew all tap washers for drips aswell). Since then the hot water doesnt work but central heating is fine. | suspect the flow switch but cant find proper info on it. CG 47 311 02 is no of boiler but worcester website downloads dont look like inside of mine? Any help/advice appreciated. Is there any checks I can do before picking phone up?