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If you are looking at this guide, then it is likely that your boiler has either stopped working or you have reason to think it is going to fail soon.
This guide will attempt to help ease your worries about how to go about getting your boiler back to work if it breaks down. So, let's start getting your central heating back up and running!
Apart from noticing no heat or hot water in your home, there are some more signs of common boiler problems, which include:
If you have found that your boiler is broken, most new boiler installaton will generate an error code when something is wrong. Take note of the error number and switch off your boiler and check if all other gas appliances like ovens and hobs are functioning. In case they aren't, it may indicate problems with the gas supply.
To start with, you need to check whether your boiler is affected by a trip in the fuse box. In case of a power failure, you have to reset the timer on your boiler, which means setting the time to the present time.
The necessary information for setting it right can usually be found in the programmer manual. You can try looking for it on the Internet, as it's pretty easy to find a copy online.
Running out of money on a prepaid meter will cause the loss of supply and therefore stop the boiler.
The ignition lead is responsible for the ignition of your boiler. In case you hear clicks when trying to start the boiler, it may mean that the ignition lead or electrode is faulty. You may also notice that the boiler starts igniting but goes off after that. With a newer boiler replacement, an error code will appear.
A certified engineer will be able to test and change this part quite cheaply.
There is a fan inside your boiler that expels harmful gases into the flue. In the case the fan stops working, the boiler will lock out and won't ignite. Ask a Gas Safe registered engineer if they can replace the fan in your boiler.
The most frequent reason why a boiler is not igniting is the malfunctioning of gas supplied to your boiler. There might be some sort of obstruction or damage to gas flow.
You need to check all gas-operated appliances and see whether they are working properly, and make sure that the emergency control valve close to your gas meter has not been switched off accidentally. A Gas Safe registered engineer will be able to check your gas supply and diagnose any problems you have.
Too high or too low gas pressure in your home will create certain problems. Your boiler is bound to show an error code when there is a problem with gas pressure. You need to ask a Gas Safe registered engineer to test your gas pressure in your system.
If you notice the smell of gas, you should immediately get in touch with the National Gas Emergency Service on 0800 111 999.
See if the hot water is turned on; otherwise, report the matter to the water supplier.
Check whether your hot water supply is switched on; otherwise, contact your water supplier to investigate the problem.
Your boiler will either not ignite or refuse to work when the water pressure is too low. To check it, just have a look at your pressure gauge or boiler display. The value should indicate that your water pressure is between 1 and 2 bar. In case the value is less than 1 bar, your water pressure is too low.
You may want to repressurize your boiler using the guidelines provided in the boiler manual. If you cannot find your manual, you can download your boiler manual online.
Your central heating programmer should be switched on, and your thermostat set higher than room temperature. In the case that your emergency heating service works according to time, it might be that the time has advanced and needs to be adjusted.
Since the UK has such a cold climate, it is really common that the weather affects your piping system, and frozen condensation creates a blockage in the system. Such a blockage will make your water fill up your boiler, causing its breakdown.
Although we recommend that you contact a professional Gas Safe Registered engineer who will help you with frozen condensate pipes, you may want to use a hot water bottle or pour warm water on the end of the pipe and switch your boiler on and off.
A pilot light is more common on old boilers and may go out for several reasons. You may relight the pilot light on your own based on the instructions in the manual or inside the boiler door.
Do not disassemble or change anything in your boiler. If you fail to relight the pilot light, feel free to contact an engineer immediately.
Your modern boiler might have a faulty code which can help to diagnose the problem soon. It is possible to fix some problems on your own, while others need the help of an engineer.
If you do not have a boiler manual, you can always get it online.
Thus, routine maintenance of the boiler system is the ultimate key to extending its lifespan. Make it a point to turn on the boiler daily and practice checking boiler pressure so that it runs efficiently. Don’t forget to book your boiler service at Vip Drainage Services London every year, even when the boiler seems to work perfectly.
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2 September 2026
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