Boiler Leak Repair

What boiler leak repair covers

A boiler leak can come from internal components, valves, seals, or nearby pipework. The aim is to stop the leak, restore stable pressure, and confirm safe operation.

• Identify the leak source (boiler casing, connections, condensate, or adjacent pipework).
• Check system pressure and expansion vessel performance.
• Test key components such as the pressure relief valve, pump, diverter valve and seals.
• Repair or replace failed parts (where appropriate and available).
• Reseal joints and rectify minor pipework issues linked to the boiler.
• Refill and re-pressurise the system correctly.
• Run operational and safety checks to confirm normal heating and hot water performance.

When to book this service

Arrange a repair if you notice water under the boiler, repeated pressure drops, staining on the casing, or gurgling and air in radiators after topping up. It is also worth booking if the boiler locks out, shows fault codes, or the filling loop needs frequent use.

If you can smell gas or suspect a gas leak, do not try to diagnose it yourself. Turn off the gas at the meter if safe, ventilate the area, and call the National Gas Emergency Service on 0800 111 999.

What to expect during the visit

The engineer will start with questions about what you have noticed, then inspect the boiler and nearby pipework. Fault finding may include pressure checks, visual inspection, component testing, and reviewing fault codes.

Once the cause is confirmed, the repair is carried out and the boiler is tested under normal running conditions. You will be told what was fixed, what to keep an eye on, and any further work recommended to prevent repeat issues.

After the repair

You will get clear guidance on next steps, such as how to monitor pressure over the next few days and when to top up (if needed). If the leak indicates wider system issues, you may be advised on follow-up options such as servicing, replacing ageing components, or improving system protection to reduce future faults.