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Plumbing Company london | Why is my radiator not heating up when the heating is on?

Sep 16

a radiator cold at the bottom


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During the colder months, knowing that our radiators will keep us warm is an important relief. Yet, it can be annoying and uncomfortable to have a radiator that stays cold even though the heating system is on.

People often ask questions about the real reasons why the radiators did not heat up. We will explain why your radiators don’t warm up when the heating is on. From faulty airlocks and valves to system imbalances and blockages, we look at the possible causes and give helpful advice on how to bring back the cosy warmth of a hot environment.

Air in the Central Heating System:

When your radiator remains cold despite the central heating being on, it might be due to the presence of trapped air within the system. This trapped air can impede the proper circulation of hot water, preventing the radiator from warming up effectively.

To tackle this issue, you can perform a simple task known as bleeding the radiators. This involves using a radiator bleed key, to gently open the air vent valve situated at the top of the radiator.

As you undertake this process, you’ll notice a distinct hissing sound, which indicates the release of trapped air. It’s advisable to have a cloth ready to catch any air-trapped water that might escape during the radiator bleeding.

Once water begins to trickle out from the radiator bleed pin consistently, you can then close the valve. This simple process helps get rid of the air that has built up inside the radiator.

This lets hot water flow more smoothly through the radiator and supply the heat more evenly and efficiently.

Cold Radiators in Some Parts of the Property

Experiencing cold radiators in specific areas of your home while others remain warm can be attributed to an imbalance within your heating system. This imbalance is often caused by differences in how water flows to different radiators, which leads to uneven heating distribution.

To rectify this situation, a technique known as balancing the system can be implemented. This involves adjusting the temperature setting on the lockshield radiator valve, situated on the opposite side of the radiator key the thermostatic valve.

By partially closing the radiator valve that warms up too swiftly, you can divert a greater volume of hot water toward the colder radiators.

This careful radiator balancing works well to keep the water flowing and heat the upstairs radiators, making sure that all of the radiators in your home have the same amount of flow temperature.


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A Thermostatic Radiator Valve is Stuck:

When your radiator remains unresponsive to heating, a broken part could be a possible cause like a Thermostatic Radiator Valve (TRV). This radiator valve serves the crucial purpose of regulating the flow of hot water into the radiator by the desired room temperature.

Should any of these valves become stuck or faulty, it disrupts the flow of hot water to the radiators, consequently resulting in cold spots and the radiator’s failure to warm up.

As a first step, tapping these valves softly with a wrench can sometimes get rid of the problem by moving the blockage.

You can also take off the top of the radiator and push or pull up on the small pin that might be stuck and stop the water from flowing.

However, if this proves unsuccessful or if the valve is beyond repair, it’s smart to think about replacing it, thereby bringing back the effective functionality of your radiator performance.

Check Your Heating Settings

In your search for the reason behind your radiator’s refusal to heat up, it’s important to check the settings on your central heating systems. Ensuring that your heating system is always functioning correctly and set up to a higher temperature than the current room temperature is very important.

If the set temperature is too low, the heating system might not initiate, resulting in a chilly radiator.

Furthermore, a meticulous examination of the central heating system’s timer and thermostat settings is advised. By making sure that these settings are correct and working properly, you can fix any problems that might stop your radiator from working at its best.

More than One Radiator Not Heating Correctly

Confronting the situation where multiple radiators fail to produce heat indicates a possible systemic problem within your central heating system.

In such cases, a comprehensive approach is required to find the underlying issue. It is best to carefully check for airlocks and make a thorough evaluation of how well the whole heating system works by looking at just one radiator.

If you’re still not sure what to do or if the problem isn’t fixed, the smart thing to do is to call a heating engineer from MML Plumbing to fix your issues.

Our skilled heating engineer can solve the problems that are causing your multiple radiators to not work.

The Boiler or Heat Pump is Not Working Correctly

When faced with the frustrating situation of a cold radiator, and a working system, a faulty boiler or heat pump stands as a potential culprit.

The boiler is a cornerstone of your whole central heating system and operation. Monitoring the boiler’s display for error codes can offer crucial insights into its functionality.

By identifying and addressing any issues within the system or combi boiler, you can then bring back your radiator’s ability to supply heat.


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