i have problem with water tempurture which is cold and then gets warm and cold again it dose not stay hot or warm . the presure is good

mike, February 2006

It sounds like you have a partially blocked plate heat-exchanger, the only way to cure it would be to remove it and flush it out or better still replace it.
Magnatite from the system blocks these so have the system flushed at the same time as you change the plate heat-exchanger and it should stop it happening again.

Kevin, a boiler engineer, February 2006