Category: Boiler Guide

A boiler NTC sensor fault can cause incorrect water-temperature readings, short cycling, unreliable heating, no hot water or a boiler lockout. Also known as a thermistor, the NTC sensor helps the boiler’s printed circuit board understand how hot the water is. When the sensor, its wiring or its electrical connection develops a problem, the boiler…

Boiler heat exchanger problems can cause fluctuating hot water, kettling noises, overheating, repeated fault codes, leaks or reduced heating performance. The exact symptoms depend on whether the problem affects the boiler’s main heat exchanger or, on many combi boilers, the separate domestic hot-water plate heat exchanger. However, these symptoms do not prove that the heat…

Boiler expansion vessel problems commonly cause pressure to rise sharply when the heating is running and then fall again after the system cools. In some cases, the pressure relief valve releases water outside, leaving the boiler with insufficient pressure once it has cooled.However, fluctuating pressure does not automatically prove that the expansion vessel needs replacing.…

A boiler ignition electrode fault can prevent the burner from lighting, cause repeated ignition attempts or make the boiler light briefly before shutting down. However, these symptoms do not always mean the electrode itself needs replacing.The ignition system includes the spark electrode, flame-sensing electrode or ionisation probe, connecting leads, burner, gas valve, appliance earth and…

Estimated reading time: 5 minutes A boiler that keeps losing pressure can be frustrating, especially when you refill the system and the pressure drops again within hours or days. Low pressure does not always mean your boiler needs replacing. In many cases, the cause could be a small leak, expansion vessel issue, pressure relief valve…

If your boiler is working but there is no hot water and no error code, the fault may be caused by a part that is giving the boiler incorrect information rather than failing completely. On a combi boiler, common causes include a faulty hot water sensor, flow sensor issue, diverter valve fault, blocked plate heat…

Worcester boilers are popular in many UK homes because they’re reliable and energy efficient. If you’re unsure how to turn your boiler on, don’t worry this easy guide will help you get your heating up and running in no time. Whether you have a combi, system, or conventional boiler, the basic steps are mostly the…

If your Worcester Bosch boiler’s pressure has dropped below 1 bar, it may not work properly. You can fix this by topping it up using an external filling hose. This guide will show you how to do it step by step, using simple instructions. What Is an External Filling Loop? An external filling loop is…

Keeping your home warm without wasting energy is important and setting a timer on your Worcester boiler is a simple way to do it. With a timer, you can schedule when your heating turns on and off throughout the day. This means your home stays warm when you need it most, like in the mornings…

If your Worcester boiler is stuck in air purge mode, it might seem like something’s wrong but don’t worry. This mode is actually normal and is designed to clear air out of the system after installation or maintenance. Still, if your boiler is taking too long or you need to reset it, you might want…