I have a Worcester 28iRSF combi boiler that keeps loosing pressure. I have had my radiator circuit pressure tested and is OK. A new heat exchanger has been fitted but still the pressure drops, it looses pressure quite quickly over a couple of days so I have to keep filling the system on a regular basis. I only take the pressure up to 1.5 bar

Geoff R, October 2009

Thank you Skip, all is well now, I had a leak under a solid floor so I have redirected the pipes above ground level and the problem is now solved. Geoff

Geoff Reeve, December 2009

Geoff , if you suspect the boiler is losing pressure carry out the following

Switch the power to the boiler off, pressurise it to 1.5 bar and isolate the flow and return (the service valves are usually beneath).

Leave overnight and note the pressure. A drop will indicate the problem is within the boiler otherwise it must be in the CH circuit. This assumes that the PRV is not letting by.

Skip, December 2009

Hi Andy, No I have had no luck with the answers I've been given. You don't mention that you have to refill your system, have you fitted a combi boiler to an old heating sytem that used to have a header tank? If this is so you may have a leak under your floor boards that was not detected with the old system. You may need to have a pressure test done on the pipe work to prove that you are not loosing water from a bad joint etc.
Geoff

Geoff Reeve, November 2009

Hi Geoff

This keeps happening to me also, at night pressure drops right off and the red flashing light always appears in the morning. Once i press the start up button(red light) it fires up and starts ok. Did yo have any luck with an answer? I too was told to look outside for a leak, but no dripping. Its just a hassle i have to walk down stairs everymorning to fire up. Is there an easy answer?

Andy, November 2009

Glen, Thank you for your message, I have checked the pressure relief valve pipe on the outside of the house and it is dry.

geoff R, October 2009

Have you checked the pressure relief pipe which should be a copper pipe that goes outside directly from the boiler.
Locate it and see if it's dripping.

Glen, October 2009