3 Common Boiler Problems (And How To Solve Them)

When it comes to plumbing, a lot of days are the same. I know it’s popular to say no two days are the same in all lines of work, but the truth is we get called out to a lot of the same sorts of problems day after day. Which is great, because it means we’re really good at spotting and fixing them. When it comes to boilers there are a lot of things that can go wrong, especially if they aren’t serviced regularly, but there always tend to be 3 issues we see cropping up time and time again. so today we wanted to share with you what the most common boiler problems are, and what you can do to fix them.

No Heat or Hot Water

This is the single most common issue we see, and it’s the most inconvenient for you as well. Especially if you want to have a nice hot bath, or do any washing up! If you’re not getting any heat or hot water, the most common causes include broken diaphragms and airlocks, failure of motorised valves, issues with the thermostat or low water levels. It’s fairly easy for you to work out if it’s due to low water pressure (all you have to do is turn on the tap) or a faulty thermostat (just check the temperature setting), but if those are both fine, you need to call a plumber.

Leaking or Dripping

No one wants a leaking tap, but we do expect them to drip sometimes. So when water is coming from somewhere else in the pipes, it can be a bit more concerning. There are a lot of reasons your boiler might start to leak water, and where the water is coming from will usually tell you roughly what the cause is. The most common we see is a broken component, like a pump seal or a valve, which just needs replacing. A good plumber will be able to find the problem and fix it pretty sharpish for you – this very much bread and butter work for them. But never try to do this yourself. Always use a professional, there are too many things that could go wrong.


No, this has nothing to do with your kitchen kettle, so don’t worry – your tea and coffee is safe! Kettling is the name for a rumbling noise your boiler can make, and it sounds a bit like a boiling kettle, hence the name. But that’s not a good noise for a boiler to make. Boilers should be seen and not heard, or both, if it’s in a cupboard. So a sudden horrible noise is a pretty big sign that something is wrong.  Generally, kittling in a boiler is caused by one of 3 things:

  • A leak in the system
  • Limescale or deposits building up
  • The boiler overheating

But honestly, the most common cause is limescale build-up, since most people don’t realise they should be cleaning their central heating systems every couple of years. Luckily this can easily be remedied with a power flush, so that’s often a good place to start. And if it’s not limescale, then you’ve done your pipes a favour by cleaning them out, and your plumber will be able to diagnose the fault more efficiently.

If you’re experiencing any of these, then you may need to call in a professional heating and plumbing engineer. At Peninsula Heating and Plumbing, our engineers are well versed in all things boilers, and can usually diagnose the problem with one visit (or a video visit during lockdown), and potentially even fix it then and there, depending on what the problem is. If you’re struggling with boiler issues, or just want a second opinion, just get in touch with the team today for your free, no obligation investigation callout.