• home
  • Blog
  • Common Boiler Issues and How to Fix Them

Updated: June 25, 2024

As a homeowner, you may not think much about your boiler until it’s not working properly. If your boiler isn’t firing up, it could be due to a number of potential causes. If your boiler stops working and you can’t figure out why, it’s always best to call a professional. A qualified technician will be able to troubleshoot the problem and get your boiler up and running again in no time.

Common Boiler Issues

No Power

If your boiler has no power, the first thing to check is the main switch. This is usually located on the wall near the boiler itself. If this switch is off, simply turn it on and wait a few minutes to see if the boiler powers up. If the main switch is on, then the next thing to check is the fuse box. If a fuse has blown, simply replace it with a new one and wait a few minutes to see if the boiler powers up.

If the problem persists, then you may need to call a qualified engineer to take a look at your boiler. In most cases, a loss of power is simply due to a tripped circuit breaker or blown fuse. However, it could also be caused by an issue with the boiler itself. Either way, it’s best to call in a professional to diagnose and resolve the problem.

Read about: Boiler on Finance

Trapped Air

If your boiler has trapped air, it can cause a number of problems. The most common problem is that the boiler will not heat up properly. This can be very frustrating, especially if you rely on your boiler for heating your home. Trapped air can also cause the boiler to make strange noises, and it can be difficult to bleed the radiators.

If you have noticed any of these problems, it is important to try and resolve the issue as soon as possible. One way to do this is to contact a qualified engineer who will be able to assess the situation and advise you on the best course of action.

In some cases, simply bleeding the radiators can resolve the issue, but in other cases, more extensive repairs may be required. Whichever route you take, it is important to address the problem as soon as possible to avoid further damage to your boiler.

Read more: best boilers in uk

Boiler Installation in Coventry

Faulty Fan

One of the most important parts of a boiler is the fan. The fan helps to circulate air and keeps the boiler operating at a consistent temperature. If the fan is not working properly, it can cause the boiler to overheat and become a fire hazard.

A faulty fan can also cause the boiler to cycle on and off more frequently, which can lead to higher energy bills. If you believe that your boiler’s fan is not working properly, it is important to have it repaired as soon as possible.

Low Pressure

If a boiler is not properly maintained, it can develop problems that can be both costly and dangerous to repair. One common issue is low pressure. Low pressure can be caused by a number of factors, including a leak in the system, an incorrect water level, or a faulty pressure relief valve.

If left unchecked, low pressure can cause the boiler to overheat and potentially burst. As such, it is important to have any boiler issues checked by a qualified technician as soon as possible. With timely repairs, you can help ensure that your boiler stays safe and reliable for years to come.

Read about: Genuine Vaillant Boilers Review In Uk

Frozen Pipe

A frozen pipe can be a big problem when it comes to your boiler. When water freezes, it expands. This can cause the pipe to burst, which can lead to a loss of heat and possible flooding in your home. If you think you have a frozen pipe, the first thing you should do is turn off your boiler.

Then, check the affected pipe for any signs of leaks or damage. If there is no damage, thaw the pipe using a hairdryer on the low setting. Once the pipe is thawed, turn your boiler back on and check for any leaks. If there are no leaks, your boiler should be up and running again in no time.

However, if there is significant damage to the pipe, you may need to call a professional for repairs. Either way, a frozen pipe is not something to take lightly – so take care and stay warm!

Blocked Burner

A blocked burner is one of the most common boiler problems. If your boiler’s burner is blocked, it can lead to a number of issues including decreased efficiency, increased fuel consumption, and even complete boiler failure. The good news is that a blocked burner is usually relatively easy to fix.

The initial step is always to identify what’s causing the blockage. The leading causes are typically debris, soot, or oil residue. Once you have determined the cause of the blockage, you can clear it away and restore your boiler to working order.

Read more: Professional & Reliable Boiler Repair Services

Damaged Diverter Valve

A boiler diverter valve is a device that controls the direction in which hot water enters a heating system. The diverter valve is located between the boiler and the radiator and is responsible for redirecting hot water from the boiler to the radiator when the thermostat calls for heat. If the diverter valve becomes damaged, it can cause a number of problems with your heating system.

For example, if the valve is stuck in the open position, it will allow hot water to flow into the radiator even when the thermostat is not calling for heat. This can cause the radiator to overheat and may damage the pipes. Alternatively, if the valve is stuck in the closed position, it will prevent hot water from flowing into the radiator, resulting in no heat being produced. Either way, a faulty diverter valve can be a serious problem that should be repaired as soon as possible.

Read about: Do you need an electric boiler service & Maintenance

Faulty Pilot Light

If your boiler’s pilot light has gone out, it’s important to take steps to remedy the situation as soon as possible. A boiler without a pilot light is not only inefficient, but it can also pose a safety hazard. Fortunately, relighting a pilot light is usually a simple process.

In most cases, all you need to do is follow the instructions in your boiler’s manual. However, if you’re having difficulty relighting the pilot light, it’s best to call a professional.

Continuing to try to light the pilot light on your own could result in damage to your boiler or even cause an explosion. Therefore, if your boiler’s pilot light has gone out, be sure to take appropriate action quickly and safely.


If you are experiencing any of the common boiler issues we have outlined in this post, it is important to take action as soon as possible. Waiting too long can lead to more expensive repairs and even a replacement of your boiler system. Contact us today if you need help resolving any boiler-related issue – we would be happy to assist you!

Read more:

Professional & Reliable Boiler Repair Services

Essential Things to Know Before Buying a New Boiler

Replacing a regular boiler with a combi boiler