water dripping from Baxi Duotec he boiler error message E119

[kathydon]

hi hope someone can help. The E119 error message came up and we repressurised to 1.5 bar. we were doing this daily pretty much, but that was with only 1 radiator on. When we put on 2 or 3 radiators we noticed that the boiler was dripping water from the back. we got an heating engineer in but he is waiting to get a gauge ie (tap washer it looks like) for the outlet adapter at the top left back of the boiler. however the engineer tried a couple of gauges he had in his van but none fitted. he also said it might not be the fault but it may be something else, but just eliminate this anyway. since then the boiler is leaking with just one radiator on which it didnt do previously, Could anyone please shed any light on what else could be at fault or any information would be really appreciated. Its a Baxi duotec he28 boiler and was installed 3 years ago.
thanks

 

[bolshy]

Your post is a little difficult to make sense of, but.......Sealed system boilers require a minimum water pressure to run, hence the error code. This code and lockout prevent dry firing the boiler and damaging the heat exchanger. How many radiators are on doesn't matter, the leaks on the boiler have to be fixed to stop the pressure dropping.
I'm going to mention the boiler's expansion vessel, because the charging valve for it (if I remember rightly) is top left in this boiler.
If the boiler's expansion vessel is also defective, or has no charge, then the system pressure when heating is on will rise quickly and the pressure relief will discharge water to outside. This is another safety feature. Trouble is, when the system cools again, the water lost in this way will cause system pressure to be low or at zero when cold. The pressure relief valves can often fail to seat again, causing further system water losses.
A competent RGI will be able to find and solve any of these problems.
If you aren't happy with the engineer, get another one.