Common boiler faults we fix
- No heating or hot water. Often caused by a failed diverter valve, pump, fan, printed circuit board or ignition component.
- Low boiler pressure. A combi boiler normally runs at around 1 to 1.5 bar when cold. Pressure that keeps dropping points to a leak on the system or a faulty pressure relief valve.
- Lockout and error codes. The boiler has shut itself down for safety. The code tells us where to start looking, but it is not a diagnosis on its own.
- Leaks and drips. Water under the boiler usually comes from a failed seal, a pressure relief valve or a corroded component, and needs attention before it damages the casing or electrics.
- Banging, gurgling and kettling noises. Usually caused by limescale or sludge restricting flow through the heat exchanger, which is common in London's hard water.
- Frozen condensate pipe. In cold snaps the plastic condensate pipe can freeze and lock the boiler out. We can thaw it and insulate or reroute the pipe so it does not happen again.
How a Swift 24-7 boiler repair works
- Phone triage. We ask about the make, model and symptoms when you call, so the engineer arrives with the right tools and the most likely parts.
- Diagnosis. The engineer tests the boiler properly and explains the fault in plain English.
- Clear price before work starts. You get the repair cost up front, and nothing is done without your agreement.
- Repair and safety checks. After the repair the boiler is tested for safe operation, including combustion readings where relevant.
Quick checks before you call
- Check the pressure gauge. If it reads below 1 bar, the boiler may need re-pressurising using the filling loop.
- Check the timer, thermostat and any smart controls are calling for heat.
- Check the boiler has power and that the fused spur switch is on.
- In freezing weather, check the condensate pipe outside. Pouring warm (not boiling) water over a frozen pipe and then resetting the boiler often clears the fault.
Smell gas? Leave the property, do not use light switches or naked flames, turn off the gas at the meter if it is safe to do so, and call the National Gas Emergency Service on 0800 111 999 straight away. Call us once the gas emergency service has made the supply safe.