Hello, Can anyone give me some advice re my Potterton Lynx boiler. Its old but is brilliant for heating our radiators but hot water is a problem and its been going on for months. One guy came out and changed the thermostat but all that happened was we could have a shower when the heating was on. Second boiler man came out and changed the divertor valve and now all that happens is that we can have a tepid shower and only when the heating is on. Ive spent over £500 now and it still doesn't work, has anyone else had this problem. I'm hoping it can be fixed and its not a new boiler situation???