When a fault code appears, it’s a sign that your boiler has detected a problem with its operation. This could be anything from low water pressure to an issue with a sensor or the gas supply. Think of it as a specific message pointing our engineers towards the cause of the problem, which helps us fix things quicker for you.

For many Glow-worm boilers, including the CXI and SXI models, topping up low water pressure is something you might be able to do. Your boiler manual will show you how to use the filling loop (usually a silver braided hose with one or two small taps) to gently increase the pressure. Watch the gauge and aim for that 1 to 1.5 bar mark. If you’re not sure, or if the pressure needs topping up frequently, it’s best to get in touch with us, as there might be an underlying issue like a small leak.

Yes, it’s very likely. If your Glow-worm boiler, whatever the model, isn't providing heating or hot water, a fault code is often the first sign of what's gone wrong. The specific code helps tell us if it’s a problem with the flow of water, a temperature sensor, the gas supply, or another part of the boiler’s internal operation.

While there's a whole range of codes, some common ones you might encounter include:

• Low water pressure codes (like F22): As mentioned, a frequent issue.
• Ignition failure codes (like F28, F29): Pointing to problems with the boiler lighting.
• Fan-related faults: The fan is crucial for safe operation.
• Overheating faults: Your boiler has safety stats to prevent it from getting too hot.
• Sensor faults: Glow-worm boilers use various sensors (e.g., for flow and return temperature) which can sometimes fail.
  If you’re getting any fault code, the safest bet is to contact a qualified engineer.

Not always for a straightforward low pressure issue if you're confident topping it up and it stays stable. However, for the vast majority of fault codes, especially any that relate to gas, combustion, internal boiler parts, or if you see a code you don’t recognise, you absolutely need a Gas Safe registered engineer. Trying to fix complex boiler issues yourself can be dangerous and might make the problem worse. Your safety is what matters most. For expert help, you can always contact us.