How to Fix a Stuck Radiator Valve
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Looking for the bigger picture? Start with our Home Repair Advice. It lays out how to decide what matters most before you dive in.
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When the weather turns colder, you rely on your radiators to keep your home comfortable. But if you find that one room is always cold or uncomfortably hot, the problem might be as simple as a stuck radiator valve.
This is a very common issue, especially if the valves haven't been turned in a while. Mineral deposits can build up inside, or the internal mechanism can simply seize up from lack of use. The good news is that you can often fix this yourself with a few basic tools and a little bit of patience.
This guide will walk you through how to identify your radiator valve type and the steps to safely get it working again, so you can have consistent, even heat throughout your home.
Image alt: A homeowner trying to turn a stiff radiator valve by hand.
Before you begin, you need to know what kind of valve you're working with. First, make sure your heating system is off and the radiator is completely cool to the touch. This is an important safety step.
Most radiators have two valves: one to control the flow of hot water in, and another on the opposite side to balance the system. The control valve is the one you’ll be working on. There are two main types:
The other valve is called a lockshield valve. It's usually covered with a plastic cap and is set by a professional to balance the heating system. You should generally avoid adjusting this valve unless it is also stuck.
Once you’ve identified your valve type and ensured the radiator is cool, you can gather your tools and get started.
Tools You'll Need:
The most common issue with a TRV is a stuck pin inside the valve body, which stops it from opening or closing.
Image alt: A diagram illustrating the location of the pin inside a TRV after the head has been removed.
A manual valve can seize up from mineral buildup, making the handle difficult or impossible to turn.
While fixing a stuck valve is often a straightforward task, there are times when it’s best to call for help.
Stop what you're doing and call an HVAC technician or plumber if:
A stuck radiator valve is a minor problem that can have a major impact on your comfort. By following these steps, you can often resolve the issue yourself and restore balanced heating to your home. Keeping track of small but important tasks like this is a key part of homeownership.
For more guidance on maintaining your home and keeping everything running smoothly, download the Casa app. Casa helps you manage repairs, plan for maintenance, and gives you the confidence to tackle common homeowner challenges.