My Worcester 28CDI heating system has been allowing pressure to escape very slowly for a few months and I have been recharging. Last weekend the situation changed and the l pressure loss went from 0.5 every three months to total every 15 mins. The system is now on the frost protection setting.
Suggestions on repair please, DIY if possible.

norman, January 2009

HI MATE ITS ROBBO THE PLUMBER.
PRESSURE THE BOILER AND TURN ON. GIVE 5 MINS AND LOOKOUTSIDE BEHIND BOILER. THEIR IS A SMALL COPPER PIPE BELOW FLUE. WHEN ON , LOOK IF ANY WATER DRIPPING OUT. IF YES A SMALL PIPE IS BLOCKED LEADING TO EXPANSION TANK. TRY THIS FIRST . PROCESS OF ELIMINATION .ROBBO P.S REPLY WID ANSWER

ROBBO, January 2009