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Common gas boiler problems and how to troubleshoot them

Gas boilers are a popular choice for many homeowners, thanks to their efficiency and reliability. However, like all heating systems, gas boilers can experience issues over time. In this article, we’ll discuss some of the most common gas boiler problems and offer tips on how to troubleshoot them.

  1. No hot water:

One of the most common gas boiler problems is a lack of hot water. If you’re not getting any hot water, there could be a number of reasons why. The first thing to check is the pilot light. If it’s gone out, you’ll need to relight it. If the pilot light is fine, the issue could be with the thermostat or the heating element. In this case, it’s best to call a qualified gas engineer to diagnose and fix the problem.

  1. Low pressure:

Another common gas boiler problem is low pressure. If you’re noticing that the pressure gauge on your boiler is reading low, you may have a leak in your system. Check for any visible leaks around your radiators or pipes, and if you can’t find anything, you may need to bleed your radiators to release any trapped air. If you’re unsure how to do this, consult your boiler’s manual or contact a gas engineer.

  1. Strange noises:

If you’re hearing strange noises coming from your gas boiler, this could be a sign of a problem. Rumbling, banging, or whistling noises could indicate a blockage in your system, a faulty pump, or an issue with the heat exchanger. If you’re hearing these types of noises, it’s best to call a gas engineer to investigate and fix the problem.

  1. Boiler keeps switching off:

If your gas boiler keeps switching off, this could be due to a number of issues. It could be a problem with the thermostat, a faulty pressure valve, or a blocked flue. Check the thermostat settings to ensure they’re correct, and if that doesn’t work, call a gas engineer to diagnose and fix the problem.

  1. Pilot light won’t stay lit:

If your gas boiler’s pilot light won’t stay lit, this could be due to a faulty thermocouple. The thermocouple is a safety device that shuts off the gas supply if the pilot light goes out. If it’s faulty, it can shut off the gas supply even if the pilot light is still lit. In this case, you’ll need to replace the thermocouple or call a gas engineer to do it for you.


While gas boilers are generally reliable, they can experience issues over time. By knowing how to troubleshoot common gas boiler problems, you can save time and money by diagnosing and fixing the problem yourself, or knowing when to call a qualified gas engineer. Remember, always follow safety guidelines when dealing with gas appliances, and never attempt repairs if you’re not confident in your abilities.

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