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. ... Combi boiler making screeching noise … We get hot water, (boiler shudders twice and then continues working). 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. The Fix: Call a Worcester Bosch service engineer or an accredited engineer, who will be able to take a look at it for you. Your boiler may still be working while making the noise, which may tempt you to not take action. Noise is really loud and vibrating. #6 – Boiler Is Making Banging Noises. 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. 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 … The banging noise is coming from the boiler (Bosch 28Si) and this then causes the rattle back down the DHW cold inlet pipe. I turn everything off, and checked 30 mins later , initially with hot water and then with c.h system. A rumbling noise coming from your boiler is a sign that it is kettling. It doesn't do it every single time, I'd say about 80% of the time. With modern boilers as the temperature increases the boiler will modulate to a lower flame. Kettling is a serious issue that is caused by mineral deposits building up on the inside of the boiler’s heat exchanger. How to get rid of banging noises from the boiler 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. Yes The Fix. Woke up a 3 am this morning with boiler on, and making loud banging noise and shuddering. Jump over to our article that covers noisy boilers here. If there is a build-up of debris, you’ll need a qualified professional to carry out a power flush. A heat exchanger that is kettling. Boiler worked all night and throughout saturday. Common fault 4: Strange banging noises. These mineral deposits are caused by hard water (water with a high mineral content) running through the boiler … Loud banging noises. Banging: Your boiler making banging noises can also be caused by debris building up on the heat exchanger, requiring a powerflush to resolve. We have Worcester Greenstar 30CDI Combi boiler and it has started making very loud vibrating noises. But with poor combustion (incorrect co2 ratio) or the heat exchanger needing cleaning it can make a bit of a strange noise. At this stage the boiler usually runs a bit quieter. 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. 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 cause ongoing problems with the central heating system. Most other types of noise are evident at all times of operation. This started 3-4 weeks ago and earlier it was once a week. The radiators were not warm. 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. Banging noises fault 4: Strange banging noises from worcester boiler making banging noise boiler common fault 4 Strange... 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