I came home last night to find there was no hot water. Looked at my boiler and the pressure guage was under the red bar, believe the red bar is where the guage should be ?

Re filled the boiler up to about 2, on the pressure gauge and it works fine for about five minutes. I have water running from the overflow pipe outside and the pressure is then lost completely down to zero and the boiler fails to work.

I have a worcester bioler 28CDI ????

Only around 4 years old

Any suggestions ??

Becki, October 2008

it is more likely to be you PRV (pressure release valve)
red cap with 3 bar written on it. it could be grit and has been resealed, however if this is the case there is a reason for it to work.

Gary, September 2011

Could also be that the expansion valve is faulty. Best get Worcester in to sort it.

xyzbird, October 2008

your expansion vessel in boiler needs recharged.get a plumber/heating engineer.its a 10 min job dont let anyone tell you its pcbs or this that and the other if they do they are at it.hunt them its 100% expansion vessel.i am a former worcester engineer.

cp, October 2008