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

Sep 19


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Cold Radiators Downstairs

The scenario of downstairs radiators remaining cold compared to their warmer radiators heating up on the upper floors can be caused by several factors.

Changes in air temperature, which are usually cooler near the ground because they are closer to the outside or lack of floor insulation, can affect how well radiators on lower floors work. This difference can also be caused by problems with the way the radiators heat the system or with how well the pump works.

To fix this problem, you can insulate the radiator pipes underneath the floorboard. Another option is to rebalance the water supply to the system so each radiator receives the same amount of water and can heat up effectively.

Sludge, Debris, or Blockages:

Over time, the continuous circulation of hot water within the radiator not heating the system can lead to the accumulation of sediment, sludge, and debris. These deposits can stop the free flow of water, which makes your radiator less effective.

One way to fix this is through a process called “power flushing.” By giving the system a thorough “power flush,” you remove all of these blockages and restore the flow of water. As a result, your radiator can distribute heat more effectively. At MML Plumbing, we can help you clean your system using a power flush or chemical flush.

Blocked Radiator Valve

A blockage in the radiator valve system is another potential issue that can hinder the effective warming of your radiator. Debris or sediment accumulation within either the lockshield valve or the thermostatic radiator valve can precipitate this issue. To find these kinds of blockages, you have to carefully check both of these radiator valves. In cases where obstructions are identified.

Depending on how bad the blockage is, the best thing to do is either clean the radiator valve or replace it. If the water runs freely, you get rid of this problem and let your radiator work again.

The Radiator Thermostat Not Working Properly

If you’re trying to figure out why your radiator isn’t warming up, a broken thermostatic radiator valve radiator. The thermostat is a key part that controls. If this radiator thermostat head doesn’t work properly, it could stop the water flowing.

A smart thing to do is to remove the radiator thermostat head and push down the pin on the radiator TRV, this might help you to release the build-up sludge. If this option is not working, the boiler or the whole central heating system needs to be checked.



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The Radiators Not Working But the Hot Water is Fine

When water runs freely in the pipework but radiators don’t work, there may be a problem with how your system circulates. This can happen if radiators not working, there are airlocks, problems with how the circulating pump works, or sludge build-up. Also, you can have some issues with the boiler diverter valve.

In this complicated case, it sounds obvious it’s best to talk to an experienced gas-safe registered engineer from MML Plumbing. With our thorough assessment, we can find the root causes of this issue and fix them on the same day.

The System Water Pressure Has a Dropped

A pressure drop in the boiler system could explain why your radiator is cold even though your central heating system is working correctly. The hot water needs to flow smoothly through the pipes and radiators. You can top up the pressure in the boiler by finding the filling loop.

So, you should carefully check the pressure gauge that is attached to the circulation pump of your boiler. If the high-pressure system gauge shows that there isn’t enough pressure, you can top up the water pressure to 1 Bar and bleed the radiators after this process.

Why Is My Radiator Cold at the Bottom?

A cold spot on the bottom of your radiator usually means that sediment or other waste has built up in the system.

If the radiator is cold at the top this means that there is air blockage in the radiator.

These obstacles make it hard for the heat to move around the radiators evenly, which causes these cool spots. Using the fix of “power flushing” can get rid of this problem in the radiators.

By carefully removing these buildups, you restore the free flow of hot water in one radiator or any other cold radiator that is in the system. Getting rid of the difference and giving your whole radiator again the ability to warm evenly and consistently.

A Few Temporary Fixes While You Solve Your Radiator Problem:

While you’re waiting for the gas-safe registered engineer to fix the radiator issues, there are a few things you can do in the meantime to don’t get too cold. Portable radiators can be used as temporary options or you can close doors and use curtains.

Why are my radiators not giving out enough heat?

Radiators that are not providing sufficient heat can be attributed to various factors within your system. One common cause is the buildup of sludge, debris, or air pockets within the radiators or the overall system.

This accumulation can impede the efficient transfer of hot water to the radiators, resulting in reduced heat output. Additionally, the functionality of all the radiators, boiler, pump, or valves could be compromised, leading to inadequate heat.

It’s also important to check the thermostat settings to ensure they are calibrated correctly for the desired room temperature.

If your radiators are still not providing enough heat, consider the possibility of radiator balancing, power flushing, or calling our professional gas-safe registered engineer.

Why is my radiator not working properly?

A radiator that is not heating properly could be encountering a range of issues. One possibility is the presence of air within the radiator or the system, obstructing the flow of the heated water within the radiator not working well. This can often be resolved by bleeding the radiator.

Another potential cause is a stuck pin faulty thermostatic radiator valve (TRV) that regulates the amount of water flowing into the radiator. A stuck or faulty TRV can prevent proper heating. Blockages and sediment buildup within the radiator can also lead to uneven heat transfer.

Furthermore, problems with the central heating system, such as a malfunctioning boiler or pump, could be contributing to the issue.

Why do I have a cold radiator despite being bled?

Even after bleeding a radiator, there are instances where it might not work properly.

The air might have been released from the radiators during the bleeding process, but airlocks can still exist within the system. These airlocks can obstruct the flow of water, preventing the radiator from heating up properly. Additionally, if there are issues with the heating pump, boiler bleeding alone might not resolve the problem.

It’s important to consider the possibility of blockages in the radiators or imbalances within the system.


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