What To Do If Your Boiler Stops Working

Step 1: Check Your Boiler Pressure

The most common reason a boiler stops working is low pressure. Your boiler pressure gauge (usually a small dial or digital display on the front of the unit) should read between 1 and 1.5 bar when the system is cold. If the needle is below 1 bar or the display shows a low pressure warning, this is likely your problem.

To repressurise your boiler, locate the filling loop — usually a silver flexible hose or lever underneath the boiler. Slowly open the valve until the pressure rises to 1.2 bar, then close it again. Once the pressure is restored, try resetting the boiler. If the pressure drops again within a few days, this suggests a leak in the system that a Gas Safe engineer near you will need to locate and repair.

Step 2: Check Your Thermostat and Programmer

Before calling for a boiler repair near you, check your thermostat settings. Make sure your room thermostat is set to a temperature above the current room temperature — if the room is already warm enough, the boiler will not fire. Similarly, check your programmer or timer. If it has been accidentally switched off or the clocks have changed recently, the boiler may simply not think it needs to run.

If you use a smart thermostat such as a Hive or Nest, check the app to confirm the heating is set to on and the desired temperature is above the current reading. Sometimes a phone update or a lost Wi-Fi connection can cause smart thermostats to lose their schedule.

Step 3: Reset Your Boiler

Most modern boilers have a reset button — look for a button labelled 'Reset' or a flame symbol with a line through it. Press and hold it for a few seconds, then release. The boiler will attempt to ignite. Give it about two minutes to start up. Many boilers lock out automatically when they detect a fault to prevent damage, and a simple reset is all that is needed to get them running again.

If the boiler locks out again shortly after resetting — particularly if this happens repeatedly — do not keep pressing reset. A recurring lockout indicates an underlying fault that needs a Gas Safe engineer in Manchester to diagnose properly. Repeated resets without a fix can cause further damage.

Warning: Never attempt to bypass a boiler lockout or interfere with gas connections. This is illegal and extremely dangerous. Always call a Gas Safe registered engineer.

Step 4: Check Your Gas and Electricity Supply

If the boiler shows no signs of life at all — no lights, no display, no sounds — check that it has power. Look at your fuse box and confirm the boiler's circuit breaker has not tripped. Also check that your gas supply is working by trying a gas hob. If you have no gas supply at all, contact your gas supplier or call the National Gas Emergency Service on 0800 111 999.

If your gas and electricity are working fine but the boiler is completely unresponsive, there may be an internal electrical fault or a failed control board that will need professional diagnosis.

Step 5: Check for Frozen Pipes in Cold Weather

In very cold weather, the condensate pipe on a condensing boiler can freeze. This is a plastic pipe (usually white or grey) that runs from the boiler to an outside drain or soakaway. When it freezes, it blocks the boiler and triggers a lockout. You can often see a fault code relating to a condensate blockage on the boiler display.

To thaw a frozen condensate pipe, pour warm (not boiling) water over the pipe and then reset the boiler. If you are not sure where the pipe exits the property, call Next Gen Boilers Ltd and our team will guide you through it over the phone.

When to Call a Gas Safe Engineer

If you have worked through all the checks above and your boiler is still not working, it is time to call a Gas Safe registered engineer. Do not attempt to open the boiler casing, inspect gas connections, or carry out any internal repairs yourself — this is dangerous and illegal for anyone who is not Gas Safe registered.

Next Gen Boilers Ltd cover emergency boiler repair across Manchester, Salford, Irlam, Eccles, Swinton, Walkden, Worsley, and the whole of Greater Manchester. We offer fast response times, fixed pricing with no hidden charges, and all our engineers are Gas Safe registered. Call us on 07305 687 331 any time for emergency assistance. Boiler Care The Next Gen Way.

Frequently Asked Questions