The banging noise is coming from the boiler (Bosch 28Si) and this then causes the rattle back down the DHW cold inlet pipe. The Cause: If you hear a strange banging noise when your boiler fires up, this is usually a problem with the gas valve communicating with the fan speed. This can often be caused by the pressure being too high or old boiler components wearing down. Hi - we have a Worcester Bosch combi gas boiler (24i RSF model) and just lately we have heard a loud banging / clicking noise when running the hot water - after a couple of days of it doing this, it then started to do it when the central heating starts up. ... Combi boiler making screeching noise … If there is a build-up of debris, you’ll need a qualified professional to carry out a power flush. Jump over to our article that covers noisy boilers here. If your Worcester boiler fault relates to loud banging noises, there’s a fix. Noise is really loud and vibrating. Common fault 4: Strange banging noises. We have Worcester Greenstar 30CDI Combi boiler and it has started making very loud vibrating noises. Banging: Your boiler making banging noises can also be caused by debris building up on the heat exchanger, requiring a powerflush to resolve. Woke up a 3 am this morning with boiler on, and making loud banging noise and shuddering. How to get rid of banging noises from the boiler Boiler worked all night and throughout saturday. Loud banging noises. Having looked at the boiler more closely I can see that the DHW cold inlet pipe simply runs in to the water flow switch, on to the heat exchanger and then out to the DHW flow. Yes: Dripping: A dripping noise is a clear indication that there’s a leak somewhere within the system. Kettling is a serious issue that is caused by mineral deposits building up on the inside of the boiler’s heat exchanger. The radiators were not warm. I turn everything off, and checked 30 mins later , initially with hot water and then with c.h system. It doesn't do it every single time, I'd say about 80% of the time. At this stage the boiler usually runs a bit quieter. The two most common causes of the problem are: An airlock in the central heating pump. The Fix. This can cause ongoing problems with the central heating system. This started 3-4 weeks ago and earlier it was once a week. Most other types of noise are evident at all times of operation. But with poor combustion (incorrect co2 ratio) or the heat exchanger needing cleaning it can make a bit of a strange noise. Boiler keeps making banging noises (A41) Hearing banging sounds from your boiler is an indication of kettling, which is generally caused by limescale buildup, a faulty thermostat or inadequate water pressure. #6 – Boiler Is Making Banging Noises. There are many different noises that your central heating system can make, and while some of them can seem worrying at first, most will be easily fixed. If you are at all unsure about any noise your heating system is making, the safest thing to do is call our friendly boiler repairs team on 0800 032 6478 or … With modern boilers as the temperature increases the boiler will modulate to a lower flame. Yes If your boiler is making loud banging noises, it may be the result of a faulty thermostat or a build-up of debris on the boiler’s heat exchanger. Boiler making banging noises ‘My boiler is making a banging / clunking noise?’ You may have noticed this fault as you turn on your heating ready for the colder months. However today within a span of 4 hours this happened twice. The Fix: Call a Worcester Bosch service engineer or an accredited engineer, who will be able to take a look at it for you. A heat exchanger that is kettling. Your boiler may still be working while making the noise, which may tempt you to not take action. 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