Radiator & thermostatic valve (TRV) repairs

Radiators that never heat, valves seized open or shut, and the pin under a TRV head that's stuck down after a summer of not moving. Repairs, replacements, balancing and relocations.

Covering North & Northwest London and the Hertfordshire borders, from our base in Colindale.

The inside of a stripped-down combi boiler

When people call us about this

  • One radiator stays cold while the rest heat
  • A TRV head spins with no effect on the radiator
  • A radiator hot at the top and cold at the bottom
  • Weeping or staining around a valve
  • Rooms that overheat no matter where the valve is set

How the job runs

  1. 01

    Work out which it is

    A cold radiator is either a stuck valve, trapped air, or sludge sitting in the bottom. They look identical from the doorway and need completely different fixes, so we check before touching anything.

  2. 02

    Free or replace the valve

    The pin under a TRV head seizes down after a summer of not moving, and it's often freeable. Where the valve body has gone, it gets replaced.

  3. 03

    Balance the system

    Once everything opens, the system gets balanced so flow is shared properly instead of the near radiators taking it all.

From real jobs

“No job is too small”

Over the years he has done boiler servicing, power flushing, toilet repair and refurbishing, even a single tap fitting — no job is too small. Most recently he installed a new boiler and water softener for us. He is prompt, courteous, meticulous and his work is of the highest quality.
Jim Wharmby · Google

Questions we get asked

My TRV spins freely and nothing happens. Is it broken?
Usually the pin underneath has seized and the head is fine. Take the head off and press the pin — if it doesn't spring back it's stuck, and that's often freeable without a new valve.
Cold at the bottom, hot at the top. What is that?
That's sludge lying in the bottom of the radiator, and the valve is fine. It points at the system water, which is why we test it rather than just bleeding the radiator and hoping.
Should every radiator have a TRV?
Not the one in the room with the main thermostat. That one needs to stay open so the thermostat reads the room properly instead of fighting the valve.

Areas we cover

We cover 17 areas in total. See every area we cover.

Other things we do

24/7 emergency callout

Radiators & thermostatic valves, priced before we start.

Gas Safe registered, 12 years in, and rated 4.8–5 stars on Google and Checkatrade.

07525 379063Request a callback