Bosch CDi40

[paul3035]

Hi there, any idea why my boiler has suddenly lost gas pressure. The PCB controller went faulty over the weekend and a Bosch engineer arrived today who replaced the board under warranty. When he ran the boiler up with the new PCB he noticed the gas pressure at the Mag Valve was only 7.6mBar.

He checked the pressure at the gas meter and the standing pressure was 24.3mBar. He checked the standing pressure at the Mag valve input and it was 24.3mBar. When turned on the boiler it slowly dropped to 7.6mBar.

I've stripped the manual valves down and pushed OFN through the pipe and it was all clear. This boiler has ran ok for 2 years. Any ideas?

Paul

 

[BingoBongo]

how long is the pipework and what size is it?

 

[paul3035]

The pipe is 22mm and is no more that 12 metres from the gas meter. There is a 15mm branch off, feeding the gas hob about 2 metres from the meter. The meter and govenor was replaced 18 months ago by Transco.

 

[mrgas]

It sounds to me like the engineer should have checked the working pressure at the meter.

 

[bengasman]

22 mm is a bit too small, but not so much too small that you would get an inlet pressure this small.
My first guess would be a problem with the service pipe or faulty meter/governor.