Zone Valve Replacement

What zone valve replacement covers

A zone valve controls the flow of hot water to a heating zone (radiators) or the hot water cylinder. This service is designed to get each zone responding correctly to your programmer, thermostat, and cylinder controls.

Typical scope includes:

• Fault diagnosis to confirm the valve is the cause, not the thermostat, wiring, pump, or controls.
• Replacement of the motorised valve actuator head, or the complete valve body where needed.
• Electrical checks on the valve wiring and end switch to ensure correct boiler and pump operation.
• Draining and refilling only what is necessary, then venting air and restoring system pressure.
• Commissioning tests to confirm each zone opens and closes properly.
• Leak checks and tidy reinstatement of pipework insulation and wiring connections.

When this service is most useful

Zone valve faults often show up as control problems rather than obvious leaks. This service is a good fit if:

• Radiators stay hot when the heating is off.
• One heating zone never warms up, or heats only intermittently.
• Hot water works but heating does not (or the other way round).
• You hear buzzing, whirring, or repeated clicking from the valve.
• The boiler fires unexpectedly, short cycles, or runs on after demand ends.

Landlords and small commercial sites often choose this service when tenants report inconsistent heating, or when a system needs dependable zoning for multiple areas.

How the replacement is carried out

Work starts with a few targeted checks to confirm the fault and identify the valve type and location. Once isolated safely, the failed part is replaced, then wiring is reconnected and verified.

Depending on the system setup and condition of the existing valve, replacement may involve swapping the actuator head only, or replacing the full valve body. The system is then refilled, vented, brought up to pressure, and tested through heating and hot water calls to confirm correct operation.

After replacement: proving the fix and improving performance

After the valve is replaced, the system should respond cleanly to its controls, with each zone heating only when called. You will be shown what was found, what was replaced, and how to spot early warning signs in future.

If testing reveals related issues (for example sticky valves elsewhere, incorrect wiring, or control settings that cause conflicts), these can be flagged clearly so you can decide the next step without guesswork.