Worcester Bosch Greenstar 4000 GR4700iW 30 C Fault codes & diagnostics

Your boiler has sensed that the water temperature has risen above the level it was set to reach, leading it to shut down for safety.

Your boiler has detected that the internal fan is not spinning as expected during start-up, so it has safely shut down to prevent unsafe operation.

Your boiler has shut down because a safety sensor has detected that it is getting far too hot, likely due to a blockage or a pump failure.

Your boiler is failing to light the gas even though it is trying to, which prevents your heating and hot water from working.

Your boiler thinks a flame is burning even though it hasn't actually sparked or started, causing it to shut down for safety.

Your boiler's computer is having trouble recognising its own internal settings, which is preventing it from starting up correctly.

Your boiler is not detecting the electrical connection to the gas supply mechanism, meaning it cannot safely ignite to provide heating or hot water.

Your boiler's internal computer is confused because its software settings don't match the specific model hardware installed.

Your boiler has detected a general internal communication failure, meaning it cannot safely operate its main control systems.

Your boiler's main control unit has identified an internal electronic error and has shut down to prevent potential damage.

Your boiler's main control unit is experiencing a communication error or electrical glitch that is preventing it from operating correctly.

Your boiler's internal computer is experiencing a communication error, meaning it has safely shut itself down to prevent potential damage.

Your boiler's internal computer is experiencing a temporary communication error, causing it to stop operating as a protective measure.

Your boiler's internal computer has encountered a critical communication error, meaning it has safely shut itself down to prevent potential damage.

Your boiler’s internal computer is experiencing a software glitch or a communication error that is preventing it from running safely.

Your boiler's internal computer is experiencing a communication error, meaning it has safely shut down to prevent incorrect operation.

Your boiler's computer has encountered an internal error and cannot operate, which means you currently have no heating or hot water.

Your boiler has detected an internal electrical problem with its main computing brain, preventing it from operating safely.

Your boiler has detected an internal communication error and has safely shut down to prevent potential damage to its electronic components.

Your boiler's internal computer is experiencing a software or communication error and needs to be restarted or investigated by a professional.

Your boiler has detected an internal computer error that is preventing it from starting up correctly.

Your boiler's internal computer has encountered a memory or communication error, which prevents it from operating safely.

Your boiler has detected an internal communication glitch during its self-test phase, which prevents it from firing up safely.

Your boiler has detected that the flame is not burning as it should and has shut itself down to keep your home safe.

Your boiler has detected that the flame-making process has stopped, preventing your heating or hot water from working.

Your boiler is struggling because the internal water pump is either jammed or air is trapped inside the system, preventing water from circulating properly.

Your boiler is having trouble managing the balance of air and gas required for safe combustion and has locked itself out to prevent potential issues.

Your boiler has detected an internal electronic error during a safety self-test and has shut itself down to prevent unsafe operation.

Your boiler's internal computer is experiencing a temporary communication error or software glitch that is preventing it from operating correctly.

Your boiler's computer is having trouble communicating with its internal memory, which prevents it from safely operating your heating and hot water.

Your boiler's internal computer is experiencing a communication error or technical glitch that is preventing it from operating correctly.

Your boiler's electronic control panel is currently unable to send or receive signals, causing the system to stop operating to prevent errors.

Your boiler has stopped working because the water pressure inside the system has dropped below the minimum level required to operate safely.

Your boiler has identified that the internal water pump is not the correct type for this specific model, which is preventing the system from operating correctly.

Your boiler is currently struggling to correctly measure the water pressure in your heating system, which prevents it from operating safely.

Your boiler's temperature sensor is providing an incorrect reading because of a faulty electrical connection, causing the system to stop heating for safety reasons.

Your boiler has lost the ability to measure the temperature of the water inside it, so it has safely shut itself down to prevent overheating.

Your boiler has stopped working because it thinks the internal heat sensor is damaged or has an electrical fault, preventing it from monitoring temperature safely.

Your boiler has stopped working because it can no longer communicate with the sensor that monitors the temperature of the main heating unit.

Your boiler has detected an internal software or electronic communication error that prevents it from operating safely.

Your boiler's main control computer is experiencing an internal error and cannot operate safely, meaning your heating and hot water will not work.

Your boiler's computer is having trouble communicating with its internal systems, which has caused it to shut down for safety reasons.

Your boiler's main internal computer has encountered a memory or communication error, preventing the system from running safely.

Your boiler has detected an internal electrical communication error, meaning it cannot properly coordinate its functions to provide heat and hot water.

Your boiler has detected a problem with how it tracks its own flame, causing it to shut down for safety purposes.

Your boiler has detected an internal electrical communication error, which means it has stopped running to prevent damage to its electronic components.

Your boiler has stopped working because the flame inside went out while it was trying to heat your water or home.

Your boiler has detected an internal software or communication error that is preventing it from operating safely.

Your boiler's internal computer has encountered a communication error or hardware glitch and needs a professional inspection to determine if the main control board is failing.

Your boiler has detected an internal communication error or hardware fault within its main control system, preventing it from firing up safely.

Your boiler's computer memory chip is not being recognised or is mismatched, which prevents the system from starting up.

Your boiler is struggling to stay lit when it is running at its lowest power level, often causing it to shut down for safety.

Your boiler has attempted to ignite several times but is failing to stay lit, so it has shut down as a safety precaution.

Your boiler has tried to start up but cannot detect a flame, meaning it cannot provide heating or hot water.

Your boiler is repeatedly trying to stay lit but failing, which means it will stop working to keep you safe.

Your boiler has detected an internal error while trying to confirm the flame is burning correctly, causing it to shut down for safety.

Your boiler's electronic control system has encountered an internal communication error and has safely shut itself down to prevent further damage.

Your boiler has stopped working because it cannot confirm that the internal fan, which is essential for safely exhausting gases, is running correctly.

Your boiler has stopped working because the internal computer cannot communicate with the fan that clears exhaust gases.

Your boiler has stopped working because it is unable to accurately read the temperature of the water inside the unit.

Your boiler has detected that water is not flowing through its internal heating system quickly enough to operate safely.

Your boiler has shut down because the water circulating inside it is getting much hotter than it should perfectly safely be.

Your boiler is heating up too quickly because the water inside cannot flow away fast enough to cool the system down.

Your boiler has detected that water is heating up unevenly inside the unit, so it has safely shut down to prevent potential damage.

Your boiler has detected that the internal water pressure has dropped too low and needs to be topped up.

Your boiler's automatic filling system has topped up the water pressure too many times in a short period, suggesting there may be a leak in your heating system.

Your boiler has detected that water is escaping from your central heating system much faster than expected, which is preventing it from running properly.

Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely.

Your boiler is struggling because the electricity coming into your home from the mains is weaker than the level required for it to operate safely.