lack of water pressure

[malley]

A fault has just occurred showing a lack of water pressure on my worcester greenstar 37CDi gas boiler 3 years old. I have tried to fill it up which keeps pressure for about 5 mins then looses all pressure on the gauge. Heating and hot water is ok.
Help

 

[muggles]

Is it losing pressure while it's on, or while it's off?

 

[malley]

Hi, its loosing pressure whilst off and on. I have just filled it up whilst off and 15 mins later its showing nil on the gauge.

Many thanks

 

[muggles]

OK, with it turned off, fill it up and turn off the valves under the boiler for the flow and return (heating pipes). Does it still lose pressure?

 

[malley]

Hi, thanks for all the information but found what the problem was the carpet fitter put a nail through the water pipe and the leak was underneath the floor. Just about to repair the pipe so many thanks for your help.