Thermostatic Radiator Valves (TRVs) in Stoke-on-Trent
A TRV lets you set each room separately instead of heating the whole house to one temperature. When one seizes or fails, that room stops responding — usually staying cold, or overheating.
What a TRV does
A thermostatic radiator valve senses the room temperature and closes the flow to that radiator as the room reaches the setting. That lets you run bedrooms cooler than living rooms, or turn off a spare room entirely, without changing the whole system.
They are a control, not a boiler upgrade. If your radiators are cold at the bottom, a TRV will not fix it — that is usually sludge. If they are cold at the top, that is air. See radiator cold at the bottom and radiator cold at the top.
Common TRV faults
- Stuck pin — the pin under the head seizes, often after summer. The radiator stays cold regardless of the setting.
- Broken head — the wax sensor or the head mechanism fails, so the valve no longer responds.
- Leaking valve — usually at the spindle or the union, which can leave damp around the valve.
- Wrong setting or a fighting thermostat — a TRV in the same room as a room thermostat can cause the two to work against each other.
Repair or replace?
A stuck pin can sometimes be freed without replacing anything. A failed head can often be replaced on its own, keeping the valve body.
If the valve body itself is seized or leaking, the valve is replaced. That means isolating and draining the relevant part of the system, so it is a job rather than a five-minute swap — and it is worth replacing the lockshield on the other side at the same time if that is also old. See lockshield valves.
After replacing valves
Replacing valves changes the balance of the system, particularly if several are done at once. Radiators may need rebalancing afterwards so heat is distributed evenly rather than the nearest radiators taking everything. We check this as part of the visit.
Booking
Call, WhatsApp with a photo of the valve, or use the quote form with your postcode. If several radiators are affected, tell us how many — it changes the time needed.
Frequently asked questions
How do I know if my TRV is stuck?
The radiator stays cold even when the valve is turned up, or stays hot when turned down. After summer, the pin underneath the head often seizes. It can sometimes be freed by hand; if not, it needs replacing.
Can a TRV be repaired rather than replaced?
Sometimes the head can be replaced on its own, or the pin freed. If the valve body is seized or leaking, the whole valve is replaced — which means draining down that part of the system.
Why does the radiator with a TRV stay cold?
It could be a stuck TRV pin, a seized valve body, trapped air, or a balancing problem. Diagnosis matters — replacing a valve will not fix an airlock.
Do I need TRVs on every radiator?
Not necessarily. They are most useful in rooms you want at different temperatures. A room with a room thermostat should generally not have a TRV fighting it, which is why the arrangement is worth checking.
Will new TRVs save money?
They give you control over individual rooms, which can reduce heating where rooms are unused. We will not promise a specific saving — it depends on how the system and the house are used.
Related services
- Radiators — Radiator repairs and replacements: cold spots, leaks, valves, balancing and new radiator installs.
- Lockshield Valves & Balancing — Lockshield valve repair, replacement and system balancing for uneven radiator heat.
- Central Heating — Central heating repairs and improvements: pumps, valves, controls, thermostats and full system faults.
- Heating Controls & Thermostats — Programmers, room thermostats, thermostatic radiator valves and motorised valves repaired and replaced.
Related advice
- Why Is My Radiator Cold at the Top? — Trapped air is the usual cause of a radiator that is hot at the bottom and cold at the top. Here is how to bleed it properly.
- Why Is My Radiator Cold at the Bottom? — Why sludge causes cold bottoms, what bleeding can and cannot fix, and when to call an engineer.