Basic Radiator Problem Solving: 5 Issues Your Radiators Might Be Having

Experiencing issues with your central heating? It’s not uncommon, most households have a heating headache at some point. Radiators are an essential component of most domestic central heating systems, and although most modern types are generally reliable they still can experience complications from time to time.

The good news is that even though your central heating system may have a number of different ‘symptoms,’ the root cause of these are generally quite common and limited. Whether it’s a lack of heat, strange noises or leaks, the radiator problem solving techniques used to fix these issues are typically quite easy and universal.

Understanding these common problems and their solutions can help you avoid bigger heating issues down the road. This guide will discuss five common radiator problems and provide troubleshooting tips to keep your heating system running smoothly coming into the winter.

Cold radiators or uneven heating

This is always quite high on the radiator problem solving list. Yes, one of the most common radiator problems is when a radiator stays cold or heats unevenly. This means parts of the radiator are warm while other sections remain cold.

Causes may include:

• Air trapped in the system
• Sludge build-up
• A faulty thermostatic radiator valve

Solutions for cold or partly heated radiators

Bleed the radiator: Do this to release any trapped air. Turn off the heating and let it cool down first. Use a radiator key to open the radiator bleed valve. You’ll hear a hissing sound as air escapes until water begins to drip out – then close the valve.

Flush the radiator: If the above doesn’t work you may have sludge build-up. In this case the radiator will need to be flushed completely. You can either attempt to flush it yourself or call a professional to do a power flush, which will clean out the entire system.

Check the radiator valve: Ensure that the radiator valve is functioning properly. If it’s stuck, try turning it fully open and closed several times to free it. If it is broken it will need replacing.

Noisy radiators

Radiators that make strange noises, such as gurgling, banging, or hissing, can be disruptive and may indicate a problem with the system. Different sounds can suggest different issues, so understanding the cause of the noise is the first step toward solving it.

Causes may include:

• Air trapped in the radiator
• A banging or knocking noise that occurs when steam or water hits an obstruction in the pipes (known as ‘water hammer’)
• Pipe expansion due to hot water temperature
• Limescale build-up that creates a whistling noise

Radiator problem solving for noisy radiators

Bleed the radiator: Same instructions as above to remove the excess air from the system and hopefully the associated gurgling sounds.

Inspect for blockages: If you hear banging noises, check for blockages in the pipes or valves. You may wish to hire a professional plumber if you’re not comfortable handling it yourself.

Secure pipes: Pipe expansion can often be reduced by ensuring your pipes are properly secured. Add padding or insulation between the pipes and joists to help prevent movement and noise.

Descale the system: In areas with hard water, you may need to add a descaling agent to the system or have a professional descale the radiators and boiler to prevent limescale build-up.

Leaking radiators

A leaking radiator could lead to serious water damage in your home if left unaddressed. Leaks can occur at different points on the radiator, including the valve, pipe joints, or the radiator body itself.

Causes may include:

• Loose valve connections
• Corrosion
• Damaged Seals

How to fix leaking radiators

Tighten your connections: Try tightening any connections using a spanner. Make sure not to over-tighten, as this could cause damage.

Replace washers and seals: Any damaged valve seals may need to be replaced. Turn off the heating system and drain the radiator before replacing any washers or seals.

Replace the radiator entirely: If the radiator itself is corroded and leaking, it may need to be replaced with a new central heating radiator. Small leaks can sometimes be temporarily fixed with radiator sealant, but this is not a long-term solution.

Radiators staying on when the heating is off

Radiator problem solving can be tricky for radiators that remain warm even when the heating is turned off. This puzzling scenario may indicate a more serious issue with your heating system.

Causes may include:

• A faulty thermostatic radiator valve 
• A problem with a diverter valve 
• Wiring issues

Solutions

Check the radiator valve: If it’s stuck, try freeing it by turning it fully open and closed. If the valve is broken, you may need to replace it.

Replace the diverter valve: If a diverter valve is faulty, you’ll likely need to call a heating engineer to replace it. This can be a complex job and should only be done by a professional.

Examine the wiring: Faulty wiring or a broken thermostat may require an electrician or heating engineer to diagnose and repair the issue.

Boiler issues

If all of your radiators aren’t heating up at all, the problem could lie further up the line in your central heating system where it all begins – your boiler! A malfunctioning boiler can prevent hot water from being pumped through the system to heat your radiators.

Check that it’s turned on and functioning properly, or if it is showing any warning signs or alerts. If you can’t work out what the problem is from your boiler’s display, it may need servicing by a qualified gas service technician. You should not attempt to do this yourself.

Avoid common radiator issues with UK Radiators

Regular maintenance, such as bleeding radiators and checking valves, will help prevent these issues from occurring. Radiator problem solving can also be avoided if you purchase quality, reliable products in the first place.

Here at UK Radiators we offer a wide selection of column radiators, designer radiators and bathroom radiators in a range of high quality materials and finishes. It’s our mission to help you get the best from your household heating systems, and make sure you don’t experience any central heating issues.
To get in touch with our friendly team, give us a call on 0333 006 8227, or send your enquiry to sales@ukradiators.com.