Common Boiler Problems And How To Fix Them!


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Common boiler problems are a frequent source of frustration, leaving you cold and wishing for the comfort of hot water and heat. But don’t worry! Many of these issues are more common than you might think, and some can even be tackled with a little DIY know-how.

In this guide, we’ll break down the most common boiler problems, including specific issues with combi, gas, and oil boilers. We’ll also offer tips on how to fix them yourself, and when it’s best to call in a professional.

No Heating or Hot water

If your heater isn’t working and there’s no hot water, a few things might be wrong. First, your boiler might need fixing. But don’t worry, it’s usually not just one thing that’s causing the problem. It could be a few things. You should start by checking the pressure and thermostat on your boiler. Make sure they’re okay. If the pressure is too low, you might need to fill it up again. Moreover, if it’s the thermostat acting up, follow the instructions to try and fix it.

On top of that, if everything seems fine but the problem persists, you should get in touch with the people who made your boiler. A professional engineer might need to take a look. They can find and fix any internal issues with your boiler, like a broken valve or diaphragm.

Low Boiler Pressure

Low boiler pressure too is one of the common boiler problems that stop your heating system from working well. You can tell if your boiler’s pressure is low by checking the gauge. So if the gauge shows less than one, your boiler might have low pressure. In fact, this can happen because of water leaks, faulty valves, or if you’ve been bleeding radiators.

To fix it, first, check the pressure gauge on your boiler. If it’s below 1, that’s likely the problem. Also, look around your boiler for any leaks. If you find any, call an expert to help. Moreover, if there are no leaks, you can reset the boiler pressure. Just follow the instructions in the manual.

Frozen Pipe

Sometimes, during winter, the pipe that carries waste from the boiler outside can freeze. This can make the boiler stop working. So to fix it, you can warm up the frozen pipe. Furthermore, you can use a hot water bottle, a warm towel, or a heating pack. You can also pour hot water over the pipe.

After you’ve thawed the pipe, reset the boiler. If you’re not sure how to do this, it’s best to ask a professional boiler engineer for help. They can make sure everything is fixed properly.

Pilot Light Issues

Older boilers need to stay on to light up the fuel inside. If your boiler keeps turning off, there might be a problem.

It could be because of a faulty part called a thermocouple that stops the gas flow. Or maybe there’s a draft blowing out the flame. Sometimes, the pilot light gets dirty with carbon, causing problems too.

To fix it, first, make sure other gas appliances are working. If not, contact your gas provider. But if everything else is okay, try relighting the pilot light by following the manual. In case, it still doesn’t work, you might need a new boiler.

Boiler not Responding to the Thermostat

When your boiler doesn’t listen to the thermostat, it can be a big problem. The thermostat tells the boiler when to heat up or cool down, so if it’s not working, your heating system won’t behave as expected.

To fix this, first, check the thermostat. Sometimes, it gets accidentally bumped and changes settings. If the settings seem right but the temperature isn’t, you might need to get a new thermostat.

Boiler Frequently Switches off

When your boiler turns on but keeps turning off, it can be frustrating. It might happen because of low water pressure, thermostat problems, or poor water flow.

To fix it, first, check the pressure gauge. If it’s below 1, you need to re-pressurize the boiler. If the pressure is okay, air might be stuck, so try bleeding the radiators.

Also, make sure to check the thermostat. If none of these solutions work, it’s time to call a licensed boiler professional for help.

Cold Radiators

If your radiators aren’t heating up like they should, there could be too much air inside or sludge blocking them.

To fix it, first, try bleeding the radiators. If that doesn’t work, you might need to flush the system. But don’t try to clean the sludge yourself. Call a heating specialist instead. They can use special chemicals to clean the system and get rid of the sludge.

Odd Noise

If your boiler is making unusual noises, like a loud kettle boiling sound, it could be because of sludge or scale buildup. This often happens in places with hard water.

To fix it, you’ll need a boiler engineer. They can clean your system using special chemicals and high pressure during a yearly service or whenever necessary. They can also add a limescale inhibitor to stop mineral deposits from building up. Regular maintenance can help prevent these problems from happening again.

Water Leakage


If you see water leaking from your boiler, it could be because of different reasons like a faulty part or rust.

To fix it, don’t try to do it yourself. Call a boiler engineer to repair it for you. They’ll know how to fix the problem safely.

Old Age

Is your boiler more than 10 years old? Older boilers might not heat your home as well because they’re getting old. Even though modern boilers are tough, they can still wear out over time if they’re not looked after.

If your boiler is getting too old, it might be time to think about getting a new one. We can help you find the right model for your home.

The Bottom Line

In conclusion, keeping an eye on your boiler’s health can save you from unexpected cold nights. Remember to address issues promptly and consider upgrading to a newer model if necessary. Firstly, if your boiler isn’t heating up, it could be due to low pressure. Check the gauge to see if it’s below. Next, if your radiators are cold, try bleeding them. If that doesn’t work, you might need a professional to flush the system. Additionally, strange noises from your boiler can indicate sludge buildup. Regular maintenance can help prevent this. Moreover, water leaks are serious.

Call a professional right away if you notice any leakage. Lastly, if your boiler is over 10 years old, it might be time for a new one. Modern models are more efficient and reliable.

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