PRESSURE PROBLEM WITH FERROLI OPTIMAX HE PLUS 38C BOILER.

1 CAN SET THE SYSTEM PRESSURE TO 1-BAR AND THEN REMOVE THE FILLING LOOP. EVERYTHING WOKS OK WITH BOTH THE HEATING AND DOMESTIC HOT WATER. OVER THE NEXT 4 TO 6 HOURS THE SYSTEM PRESSURE WILL RISE TO ABOUT 3-BAR. I WILL THEN RELEASE WATER FROM THE SYSTEM UNTILL IT IS BACK TO 1-BAR AND THE PROCESS STARTS OVER AGAIN. WHEN IT REACHES 3-BAR I WILL RELEASE SOME WATER AND SO ON. IF I ISOLATE THE COLD WATER FEED TO THE BOILER THEN OBVIOUSLY THE PRESSURE REMAINS CONSTANT. COULD IT BE A PROBLEM WITH THE DOMESTIC HOT WATER HEAT EXCHANGE UNIT ?. I WOULD BE VERY GRATEFULL IF ANYONE COULD HELP ME OUT WITH THIS PROBLEM. MANY THANKS ANTHONY MARCH.

antony march up to the middle sticky at the top of the listings page
its about boilers and central heating
click on it and look through untill you find the bit about recharging your expansion vessel

Is your filling loop letting by?

booty40uk said:

Is your filling loop letting by?

Click to expand...

He's just said it's disconnected. Mains passing through hex.

Doh!!
MUST BE THOSE BIG LETTERS