Radiators Not Working but Hot Water Is?
It’s frustrating when you switch on the heating only to find your radiators stay stone cold, even though the hot water is running as normal. If this sounds familiar, you’re dealing with one of the most common central heating problems: radiators not working but hot water is?
The good news is this issue can usually be fixed. Some causes are simple checks you can do yourself, while others require professional attention. Let’s go through the possible reasons, what you can try at home, and when to call an engineer.
Why Radiators Stop Working While Hot Water Still Runs
It might seem strange that your boiler can heat water for taps and showers but not your radiators. The reason is that your boiler has separate functions for hot water and central heating. That means a fault can affect one side of the system while the other continues working.
Common reasons for radiators not working but hot water is?
1. Heating Controls Are Incorrect
One of the simplest causes is incorrect settings. Many boilers have an option for “hot water only.” If your controls are set this way, your taps will work fine, but your radiators won’t switch on. Always check your thermostat and programmer before assuming a bigger fault.
2. Air Trapped in Radiators
Air bubbles can block hot water from flowing properly. The typical sign is a radiator that’s warm at the bottom but cold at the top. Bleeding your radiators often fixes this, and it’s a task most homeowners can safely carry out with a radiator key.
3. Stuck Diverter Valve
The diverter valve directs hot water either to your taps or to your heating system. If it gets stuck in the hot water position, you’ll be left with radiators not working but hot water is? This is not something you can fix yourself it usually requires a heating engineer.
4. Faulty Circulation Pump
Your circulation pump pushes hot water from the boiler into the radiators. If the pump fails, the boiler may still heat water for taps but won’t send it around your heating system. Symptoms include noisy radiators or lukewarm heating that never reaches full temperature.
5. Thermostat Problems
If your thermostat is faulty, has flat batteries, or is positioned in the wrong place, it may be telling your system that no heating is needed. Always check settings and battery levels when dealing with radiators not working but hot water is?
6. Sludge or Blockages
Over time, radiators and pipes can fill with a thick sludge made of rust, dirt, and limescale. This buildup prevents hot water from circulating efficiently. Cold patches on radiators or uneven heating are classic signs. In these cases, a professional power flush is usually needed.
7. Boiler Issues
Sometimes, the boiler itself is the problem. Low pressure, faulty sensors, or error codes can all stop heating from working while hot water remains unaffected. If your pressure gauge is below 1 bar, try topping it up. Otherwise, you may need an engineer to inspect the boiler.
What You Can Safely Try Yourself
Before calling an engineer, there are a few simple checks that may resolve the issue:
- Make sure your boiler settings include heating, not just hot water.
- Check the pressure gauge, it should sit between 1 and 2 bar when cold.
- Bleed radiators that feel warm at the bottom but cold at the top.
- Reset the boiler if it’s showing an error code.
If none of these solve it, and you still have radiators not working but hot water is?, it’s time to get professional help.
Why You Shouldn’t Ignore the Problem
Cold radiators are more than an inconvenience. If your heating system isn’t working properly, it could be wasting energy and driving up your bills. Issues like a failing pump or stuck diverter valve won’t sort themselves out. Leaving them too long often leads to more expensive repairs down the line.
So if you’re facing radiators not working but hot water is?, it’s worth sorting it sooner rather than later.
Professional Help for Heating Issues
At some point, DIY checks won’t be enough. When your heating still won’t switch on, our Gas Safe registered engineers can help. We deal with cases of radiators not working but hot water is? every day, and we know how to get systems running smoothly again.
Whether it’s:
- Replacing a faulty diverter valve
- Fixing or replacing a circulation pump
- Power flushing sludge from the system
- Repairing boiler faults or low pressure issues
We’ll diagnose the problem quickly and provide a safe, lasting solution.
Preventing Radiator Problems
The best way to avoid running into radiators not working but hot water is? is regular maintenance. A yearly boiler service can catch small faults before they turn into big ones. You should also:
- Check your boiler pressure every few weeks
- Bleed radiators when needed
- Keep an eye out for leaks around pipes and valves
- Book a professional flush if radiators develop cold spots
Final Thoughts
If you’ve found yourself wondering, “Radiators not working but hot water is?”, you’re not alone. It’s a very common problem, but also one that can be fixed. Sometimes it’s a quick DIY job like bleeding radiators or adjusting settings. Other times, it needs professional repair.
Don’t ignore it, acting quickly keeps your home comfortable, protects your boiler, and saves money on bills.
Need Expert Help?
At Onsite Contractors And Plumbing Ltd, we provide fast, reliable support for heating systems across London. If you’re stuck with radiators not working but hot water is?, our team of qualified engineers will put it right.
- Same-day and emergency call-outs available
- No subcontractors only trusted in-house staff
- Clear, upfront pricing with no hidden charges
Call us today and let us get your radiators heating properly again.
