Boiler burping noise

[Decimal50]

Hi all, 

I own a new built which got shipped with a Logic Combi ESP1 35, this has been fine for the first 6-8 Months, then started to make a bizarre noise when igniting.

The logic engineer came about and said it was an Ignition Explosion, due to too much gas supplied by the governor next the Gas meeter outside. The gas governor has been replaced by a brand new one and fitted, howevet the weird noise started to occur again and wonder if one day it will just blow up! Here are couple of videos that show the ignition fart once the hot water is activated at the tap:

 

 

 

https://vimeo.com/1020749731

 

Would you have any more opinion or ideas on this? Water pressure is 1.5 bar when idle and radiators have been bleed everywhere.

Thanks 

P

[Decimal50]

This boiler issue has been a nightmare. Ideal's engineer, confirmed today that the gas valve had already been replaced on the last visit, so it was in place when I had the boiler last serviced.

He measured the gas pressure with a digital gauge, showing 28 mV at the boiler and sometimes up to 48 mV at the meter—very high, just like what I reported a year ago.

 

SGN came to check as well, using a water gauge, and found 27 mV at the meter (acceptable) but 65 mV on the gas main, which is high. Apparently, high pressures like this are common in new builds with IGTs. They even replaced the governor as a courtesy, though they didn’t see anything wrong with it.

 

Now it feels like a blame game: Ideal says water gauges are inaccurate, while SGN claims digital meters are unreliable. Meanwhile, I’m left with this issue and a boiler warranty that’s almost expired.

The SGN engineer mentioned that if the house pressure really were 27-28+ mV, there would be noticeable effects, like bigger flames on the gas hob. Not sure if that’s accurate, but I feel stuck in a loop with each company passing the blame.

 

Ideas?

[SimonD]

Quite difficult to tell not standing infront of the boiler, but has anyone checked the condensate trap and drain? You can get a very similar sound on ignition if it's blocked and there's condensate backed up into the hex.

 

You probably also mean mBar rather than mV.

 

If gas pressure is too high you will see larger flames on a hob - how much larger at 27-28mBar is the question.

 

Water gauges are about as accurate as you can get as long as there isn't a kink of obstruction on the gauge/hoses. A digital gauge is very accurate too as long as it has been calibrated as it should be annually. I use a digital gauge all the time and it's spot on, and the Network provider has never questioned my measurement when I call for a replacement regulator because of either low or high supply pressure.

 

What were the measurements after replacing the regulator? As that should have been tested given the questions.