10 Tips to Help You Fix Common Boiler Issues

August 9, 2023

A reliable boiler is your best friend for maintaining a cozy and comfortable home. However, even the most dependable boilers can occasionally run into problems. Before you call in the pros. Here's a guide to help you troubleshoot and tackle ten common boiler issues.

1. The Pilot Light Keeps Going Out

If your pilot light keeps extinguishing, it might be due to a faulty thermocouple or a draught. Make sure the area around the boiler is well-ventilated and free from any drafts. If the issue persists, the thermocouple may need replacement. Check the user manual for guidance or consult a professional.

2. The Boiler Is Making Noises

Are your boiler emitting strange noises? These could range from gurgling to banging sounds. Air trapped in the system or a buildup of limescale might be the culprits. Try bleeding the radiators to release the trapped air. If the noises persist, consider descaling the system or having a professional take a look.

3. No Heating or Hot Water

Losing heating and hot water can be a nightmare, but don't fret. Begin by checking your thermostat settings and ensuring it's set to your desired temperature. Next, inspect the pressure gauge on your boiler – low pressure can lead to heating issues. If it's too low, consult your manual to safely increase the pressure. If problems persist, it could be an issue with your pump or motorized valves.

4. Boiler Is Leaking

Water pooling around your boiler is concerning, but it might have a straightforward fix. Check for loose fittings, connections, or pressure relief valves. If you identify a leak, turn off the power and water supply, and tighten or replace the affected component. In case of persistent leaks, it's wise to call a professional.

5. Low Boiler Pressure

Is boiler pressure too low? Your manual can guide you through repressurizing your system safely. Typically, you'll find a filling loop that allows you to restore the pressure. However, if the pressure continues to drop, it might be indicative of a hidden leak or a malfunctioning pressure release valve.

6. Radiators Are Cold

Cold radiators are a common problem. Begin by checking if your radiators need bleeding. Trapped air can hinder their performance. If the issue persists, the system might need balancing, which involves adjusting the flow of hot water to each radiator. If this sounds daunting, a professional can help.

7. Boiler Is Kettling

Kettling, resembling a boiling kettle, is usually due to limescale buildup on the heat exchanger. This reduces efficiency and can even damage your boiler. Consider using a descaling agent to clear the limescale, but exercise caution and follow the product instructions. If unsure, consult a heating engineer or boiler manufacturer.

8. The Boiler Isn't Responding to the Thermostat

If your boiler seems unresponsive to your thermostat settings, begin by checking if the thermostat needs new batteries or reprogramming. Ensure the thermostat is in a suitable location away from direct sunlight, drafts, or heat sources. If problems persist, there might be an issue with the wiring or the thermostat itself.

9. Frozen Condensate Pipe

During cold snaps, the condensate pipe, which carries wastewater from your boiler, can freeze and block. You can try thawing with warm water or a thermos. To prevent future freezing, consider insulating the pipe or re-routing it to a warmer spot.

10. The Boiler Keeps Switching Off

If your boiler keeps shutting down unexpectedly, it might be due to various issues. Check for issues like low water pressure, blocked vents, or faulty thermostats. Additionally, modern boilers have safety features that shut them off if they detect a problem. If you can't pinpoint the cause, contacting a professional is the safest route.

In conclusion, by following these ten troubleshooting steps. You'll be better equipped to tackle common boiler problems and keep your home warm and comfortable. Remember, safety always comes first. And if you're unsure about anything, don't hesitate to reach out to a qualified professional.


I believe in making the impossible possible because there’s no fun in giving up. Travel, design, fashion and current trends in the field of industrial construction are topics that I enjoy writing about.

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