i got a ferroli optima 701 and can only get hot water intermitantly , i've changed the temp sensor switch and reprimed it but i only get hot water when the boiler wants me to have it . Whe i turn the tap on the boiler fires up and then clicks and then shuts down , behind the front panel theres a row of l.e.d lights 1 lights up red when it shuts down then it won't let me do anything for about 2 mins

dil72, April 2009