Hello all. Hope someone can help, just recently I have no hot water unless the heating is switched on. I have made no adjustments, it has just happened. Once the heating has been on for about 5 minutes the water is piping hot again. Help??
Most probable cause is a faulty motorised valve in the airing cupboard. Assuming you have an indirect cylinder that is. You have not realy given us much to go on . ie.type of system and boiler installed.