If you own a home or rental property in Shepperton or nearby, you will know how much we rely on our boilers. From early morning showers to keeping the house warm after a walk along the Thames, it is not something you think about until it stops working. As a local heating engineer in Surrey, we see the same faults crop up time and time again across the county.
Some issues are minor and quick to put right. Others need urgent professional attention to prevent damage or safety risks. Below is a straightforward guide to the most common boiler faults we see, what warning signs to look for and when it is time to call in a Gas Safe engineer to fix your boiler.
No Heating or Hot Water
Few things are more frustrating than turning on the tap and getting cold water, or finding your radiators stone cold on a chilly Surrey morning.
Common causes include:
- Faulty motorised valves
- Broken diaphragms or internal components
- Airlocks in the system
- Low boiler pressure
- Issues with the thermostat
Sometimes it is something simple, like the timer being knocked or batteries in a wireless thermostat running flat. We often get calls where the fix takes minutes. Other times, especially with older boilers, internal parts have simply worn out.
If basic checks do not restore heating or hot water, or if the boiler is showing an error code, it is time to call a Gas Safe registered engineer. Do not attempt to remove the casing yourself. Modern boilers are complex and tampering can be unsafe.
Low Boiler Pressure
Low pressure is one of the most common issues we see in homes across the area. Most combi boilers should sit around 1 to 1.5 bar when cold.
Signs of low pressure:
- The pressure gauge has dropped below 1 bar
- Radiators are not heating properly
- The boiler keeps switching itself off
Homeowners can often top up the pressure using the filling loop, provided they know how to do it safely. Your boiler manual will explain the process. If you are unsure, it is better to ask. Over-pressurising can cause its own problems.
If pressure keeps dropping, there may be a leak in the system, a faulty pressure relief valve or an issue with the expansion vessel. Repeated topping up is not a long-term solution and should be checked properly.
Leaking or Dripping Boilers
Any sign of water around your boiler needs attention. We often find small leaks during routine call outs where the homeowner has noticed a damp patch inside a cupboard.
Typical leak points:
- Loose pipe connections
- Corroded heat exchangers
- Faulty seals or internal components
- Pressure relief valve discharging
Leaks can lead to corrosion, electrical faults and damage to surrounding units or flooring. In kitchens in places like Walton-on-Thames, we sometimes see swollen cupboard bases where a slow leak has gone unnoticed for months.
If you spot water, turn the boiler off and contact an engineer. It is far cheaper to repair a small fault early than deal with major component failure later.
Strange Noises (Banging, Whistling, Gurgling)
Boilers should not be noisy. If yours starts banging, whistling or making gurgling sounds, it is trying to tell you something.
These noises can indicate:
- Air trapped in the system
- Limescale build-up on the heat exchanger
- Pump issues
- Low water flow
In hard water areas of Surrey, kettling is fairly common. This is when limescale restricts water flow inside the heat exchanger, causing it to overheat and make a rumbling noise similar to a kettle boiling.
Left untreated, these issues can shorten the life of your boiler and increase energy bills. A proper system check and, in some cases, a powerflush may be recommended.
Pilot Light and Ignition Problems
If your boiler will not ignite or keeps going out, it could be related to the pilot light or ignition system.
Common causes include:
- Faulty ignition leads
- Worn out electrodes
- Gas supply issues
- Faulty thermostats
Modern boilers use electronic ignition rather than traditional standing pilot lights. Fault finding often requires diagnostic equipment and manufacturer knowledge.
Repeated resets are not a fix. If your boiler keeps locking out, it needs professional attention to identify the root cause safely.
Frozen Condensate Pipes in Winter
During cold snaps, especially when temperatures drop overnight, we receive a surge of calls about boilers that have suddenly stopped working.
In many cases, the condensate pipe that runs outside has frozen. This causes the boiler to lock out as a safety measure.
Homeowners can sometimes thaw a frozen condensate pipe by carefully pouring warm, not boiling, water over the pipe. Insulating exposed pipework can help prevent it happening again.
If you are unsure or the problem persists, it is best to arrange a visit. We often see this in properties with long external pipe runs that were not ideally positioned during installation.
When to Repair vs Replace Your Boiler
This is a question we are asked regularly. The answer depends on age, condition and repair history.
If your boiler is under ten years old and generally reliable, repairs are usually worthwhile. For older systems, especially those over 12 to 15 years old, recurring issues may indicate it is nearing the end of its working life.
Other factors to consider:
- Rising energy bills
- Difficulty sourcing parts
- Frequent breakdowns
- Lower efficiency compared to modern models
We always give honest advice. Sometimes a straightforward repair makes sense. Other times, investing in a new A-rated boiler will save money and stress over the long term.
Why Choose RJG Heating and Plumbing Ltd
Choosing a local engineer means you are dealing with someone who understands the types of properties in the area, from older terraces in Staines to newer developments in Addlestone.
RJG Heating and Plumbing Ltd provides Gas Safe registered engineers, clear communication and prompt response times. We know how disruptive a boiler breakdown can be, particularly for families and landlords with tenants to look after.
Our approach is straightforward. Diagnose properly, explain the issue in plain English and carry out safe, reliable repairs that last.
We help fix boiler faults every week across Shepperton, Staines, Walton-on-Thames, Egham, Chertsey, Addlestone, and Ashford along with annual servicing to help prevent breakdowns in the first place. If your boiler is showing warning signs or has stopped working altogether, do not wait for it to get worse. Call RJG Heating and Plumbing Ltd to book a fast, reliable boiler repair in your area.