40 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Advance Plus SV
This boiler uses LED flash patterns
Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →
The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 41-583-27 | Advance Plus 16S ErP | 2015–present |
| 41-583-33 | ADVANCE 25S | 2017–present |
| 41-583-34 | ADVANCE 30S | 2017–present |
Tap any card for details
Your boiler is simply reminding you that its annual service interval has been reached and it is due for a routine professional check-up.
Your boiler is failing to light the burner because it cannot detect a flame, so it has safely shut itself down to prevent gas buildup.
Your boiler is failing to light the flame needed to produce heat or hot water, or it is confused about whether a flame is currently present.
Your boiler has detected that it is overheating and has automatically switched itself off to prevent damage or dangerous conditions.
Your boiler has stopped working for safety reasons and needs to be reset or inspected by a professional.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.
Your boiler has stopped working because the water pressure inside the heating system has dropped too low.
Your boiler is struggling to detect the necessary airflow required to operate safely, which is preventing it from firing up.
Your boiler is struggling to detect the necessary airflow or water pressure required to safely ignite and heat your home.
Your boiler is failing to monitor the temperature of your hot water properly, which means it will stop heating your taps until the faulty sensor is fixed.
Your boiler has lost the ability to accurately measure the internal temperature of the water used for your radiators, causing it to stop heating as a safety precaution.
Your boiler is struggling to detect the temperature of your hot water, which may cause your hot water to be inconsistent or unavailable.
Your boiler is struggling to accurately measure the temperature of your hot water, which will likely prevent you from having a consistent hot water supply.
Your boiler is having trouble reading the temperature of the cold water coming into the system, which may cause issues with getting your hot water to the right temperature.
Your boiler is struggling to understand the temperature outside because a sensor wire is faulty or disconnected, which may stop the heating from turning on correctly.
Your boiler has detected an issue with the sensor that monitors the temperature of the exhaust fumes, meaning the boiler has temporarily shut down to stay safe.
Your boiler has detected a communication problem with a sensor that monitors the temperature of the gases leaving your flue, meaning the boiler has shut down for safety.
Your boiler has detected that the temperature of the exhaust gases leaving the unit is too high, causing it to shut down for safety reasons.
Your boiler is detecting a flame inside the unit even when it has been instructed to turn off, which forces a shutdown to prevent a safety hazard.
Your boiler has stopped working because it is unable to accurately read the temperature of the water returning to it from your radiators.
Your boiler's return water temperature sensor is not providing a signal, which prevents the unit from heating water correctly.
Your boiler has detected that the water leaving the heater is significantly hotter than the water returning, suggesting a poor flow or a blockage in your heating system.
Your boiler is struggling because there is a major difference in temperature between the water leaving the boiler and the water returning to it, often caused by a restricted flow in your heating system.
Your boiler has stopped heating because it has detected an internal blockage or a failure in the water circulation system that is causing the unit to dangerously overheat.
Your boiler has detected that it is dangerously overheating or the internal water pump has stopped working, so it has shut down to protect itself from internal damage.
Your boiler has stopped working because it cannot accurately measure the temperature of the water returning to it, preventing the system from heating safely.
Your boiler has stopped working because it cannot open the internal gas valve to light the burner safely.
Your boiler has failed to ignite because it has detected an internal fault with the gas valve mechanism, meaning it cannot safely start heating your home.
Your boiler has detected a problem with the gas valve and has shut itself down as a safety precaution, meaning you currently have no heating or hot water.
Your boiler has stopped working because it cannot safely control the internal gas flow, triggering a safety shut-off.
Your boiler has failed to light the flame, so it has automatically shut down for safety reasons.
Your boiler has detected an issue with the fuel or air flow during the burning process and has safely shut itself down to prevent any unsafe operation.
Your boiler has detected an internal communication or electrical connection issue, causing it to lock itself out to prevent further damage.
Your boiler has detected a problem with the internal electrical connections that is preventing it from starting up safely.
Your boiler's computer has lost its internal settings and cannot identify which specific model it is, preventing it from starting up safely.
Your boiler's computer has lost its internal settings, meaning it doesn't know how to operate correctly for your specific model.
Your boiler has encountered a general safety error and has shut itself down to prevent damage, requiring you to attempt a reset before calling for professional help.
Your boiler is failing to light the flame or keep it running, so it has safely shut itself down to prevent a gas build-up.
Your boiler has lost all electrical power, meaning it cannot operate your heating or hot water at this time.
Your boiler has detected that the water inside the unit is getting too hot while it is trying to heat your tap water, so it has shut down to prevent damage.
BoilerFaultCodes