Worcester Bosch Greenstar 8000+ Style GR8701iW 36 CB Style 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 flame has gone out while it was trying to heat your water, which means the boiler has safely shut itself down to prevent any issues.

Your boiler has been intentionally switched off or put into standby mode by an external device, such as a smart thermostat, a programmer, or a safety control system.

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 is confused because its internal computer board and its identification settings do not match up correctly.

Your boiler has detected an internal system communication error and has safely shut down to prevent further issues.

Your boiler has detected an internal electronic failure within its main control system and has safely stopped working.

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

Your boiler's main control computer is experiencing a temporary glitch or internal error, which has caused it to stop working for safety reasons.

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 electronic or control system error that is stopping 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 electronic error with its main control board, which has temporarily shut it down for safety.

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

Your boiler has run a routine internal safety check on its main electrical switches, but it needs an engineer to clear the code and check the internal control board.

Your boiler has temporarily stopped working because it cannot reliably detect or keep the burner flame lit.

Your boiler has temporarily stopped working because the flame and internal airflow were unexpectedly interrupted.

Your boiler has detected that water is not circulating properly through the system because the internal pump is either jammed or trapped air is blocking the flow.

Your boiler has detected an internal electronic communication error, meaning it has temporarily stopped working for safety.

Your boiler's main electronic control system has experienced an internal communication failure and cannot identify its own components.

Your boiler has detected an internal electronic or control board error and has safely shut down to prevent damage.

Your boiler has detected an internal communication error and has safely shut itself down to prevent it from operating incorrectly.

Your boiler's internal control parts have temporarily lost their ability to talk to each other, which stops the system from working.

Your boiler has detected that the burner is running at its maximum capacity for too long, causing it to proactively shut down to prevent overheating.

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

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 struggling to accurately monitor the temperature of the water returning to it, so it has stopped working to prevent potential overheating.

Your boiler is having trouble measuring either the outside temperature or the oxygen levels in the flue, which is preventing it from running efficiently or starting up correctly.

Your boiler has temporarily stopped working because a temperature monitoring sensor has detected an electrical wiring or internal fault.

Your boiler has temporarily stopped working because it has lost the electronic signal from one of its internal temperature sensors.

Your boiler's internal computer has encountered a critical electronic failure and can no longer communicate with its own sensors or controls.

Your boiler's internal computer has encountered a communication error or technical glitch that is preventing it from running properly.

Your boiler has detected an issue with how exhaust gases are being discharged, causing it to shut down for safety.

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 an issue with the flame and has shut down as a safety precaution to ensure no unburnt gas is escaping.

Your boiler has detected an internal electrical system issue and has safely shut down to prevent damage.

Your boiler has detected an internal electrical problem that is preventing it from starting up safely.

Your boiler has experienced an internal electrical error that has caused it to stop working for safety.

Your boiler's internal computer has detected a general electrical communication error and has shut down as a safety precaution.

Your boiler's main control unit has detected an electrical communication failure, meaning the system cannot safely operate your heating or hot water.

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 safety fault in its main electronic brain and has safely shut down.

Your boiler's computer brain has detected an internal electronic chip that doesn't match the model or has become loose.

Your boiler is struggling to stay lit when running at a low power level, which is preventing it from providing steady heating or hot water.

Your boiler is struggling to detect a flame when it tries to work at full power, meaning it cannot provide consistent heating or hot water.

Your boiler is trying to ignite but cannot detect a flame, meaning it is currently unable to provide heating or hot water for safety reasons.

Your boiler keeps trying to light, but the flame goes out repeatedly and it has safely locked itself out.

Your boiler has detected an internal error while trying to confirm it is burning fuel correctly, and it has shut down as a safety precaution.

Your boiler has detected an incorrect or incompatible internal configuration setting, which stops it from operating safely.

Your boiler's internal settings or water system configuration have not been properly recognized, which stops it from operating correctly.

Your boiler's internal electronic control system has identified a technical failure that requires an expert to reset or replace the faulty circuit board.

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 it cannot move the air and exhaust gases through the system properly.

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

Your boiler has temporarily stopped working because the water inside it has become too hot and cannot circulate properly.

Your boiler is getting too hot too quickly because water isn't flowing through it properly, so it has safely shut itself down to prevent damage.

Your boiler has detected that it has been topped up with water too many times, which usually means there is a hidden leak somewhere in your heating system.

Your boiler has detected that the water pressure in your heating system is dropping too quickly, which usually points to a leak or trapped air.

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

Your boiler has detected that the electrical supply voltage coming from your home's mains is lower than it needs to be.

Your boiler has gone into a secure lockout state and stopped working to protect itself, but it can usually be unlocked by pressing the control buttons.

Your boiler has completely locked itself for safety reasons and needs to be manually reset or checked by a professional.