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Discuss Boiler making banging sounds and pressure fluctuates in the Central Heating Forum area at PlumbersForums.net

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Hi,

We recently moved into a new rental property and have had issues with the heating. The house has a Baxi boiler, and when we moved in it wasn't working, with an E119 error, but this was easily fixed with topping up the water. However, about twice a week I need to do a top-up, so there must be a leak somewhere. But that is not all. What is worse is that the boiler will on occasion making some quite loud banging sounds, and the pressure will fluctuate qute a lot when it does this. I'm attaching a video that I took this evening. Besides the banging and pressure stuff, it also seems odd to me that the temperature is going up as the banging occurs, especially that it goes over 81C, when the water is set to 75C.

The hot water also seems to run out quite quickly. The landlord had an engineer in the other day, and he said the expansion vessel (I think) was empty and this was causing it, so he refilled it. I can't tell if it made a difference, only that it didn't solve it completely, as there sometimes could be days between this happening anyways.

So what could be causing this?

I should mention that the hot water system is quite complicated in the house, with a hot water solar system, and a connected coal stove in addition to the combi boiler. But the solar system is currently not working, and we haven't used the stove.

Any help or ideas is very welcome.
 

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  • 20211206_221035_001.mp4
    81.9 MB

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