BoilerFaultCodes.com

Worcester Bosch CDi Classic Fault Codes

Regular Natural GasLPG 30-40 kW 2012-2019 Discontinued

Replaced by: Greenstar 8000 Life

All 50 fault codes

Code Severity Plain English
9U 233 High Your boiler's main internal computer or memory chip has developed a communication fault or has failed, meaning the unit cannot safely control the heating process.
226 Low Your boiler has logged a note that a technician's diagnostic tool was plugged in while viewing the error history, but this itself is not a functional breakdown.
235 High Your boiler's internal computer parts are unable to communicate with each other due to a software mismatch.
328 High Your boiler has detected an issue with the quality of the electricity supply coming into your home, meaning it cannot operate safely.
356 High Your boiler is not receiving enough electrical power from the main supply to operate safely and has shut down as a precaution.
360 High Your boiler's computer chip has failed or is recognized as incorrect, meaning the main brain of the boiler cannot talk to its control board.
A1 281 High Your boiler is struggling to move water through the system, either because the pump is jammed or there is not enough water present.
A8 362 High Your boiler is struggling to operate because the electrical power reaching it is unstable, insufficient, or the control module has failed to recognize the incoming voltage.
B1 High Your boiler’s internal computer chip has lost connection with the main control board, meaning the system cannot identify which model it is and has stopped working for safety.
B7 257 High Your boiler's internal computer has developed a fault and can no longer communicate with the main control system.
C1 264 High Your boiler's fan has unexpectedly stopped working while the unit was running, causing the system to shut down for safety.
C4 237 High Your boiler's main internal computer has developed a serious electronic fault and can no longer control the heating process safely.
C4 273 High Your boiler has stopped working because the internal fan has been running non-stop for too long, causing the system to shut down for safety.
C6 High Your boiler has stopped working because the internal fan that clears away waste gases is not spinning fast enough to operate safely.
C6 215 High Your boiler has detected that the internal fan is spinning faster than it should, which has caused the system to shut down for safety.
C7 214 High Your boiler's fan is failing to start up, which means the system cannot safely clear waste gases and will not allow the boiler to ignite.
C7 216 High Your boiler has stopped working because the fan that clears exhaust gases is not spinning at the correct speed.
C7 217 High Your boiler has shut down because the internal fan, which safely clears waste gases, has stopped spinning while the boiler was running.
CC 800 Low Your boiler has lost communication with its outdoor temperature sensor, meaning it won't be able to adjust its energy use based on the weather outside.
D4 341 High Your boiler is overheating because water is not moving through the system quickly enough to carry the heat away.
E2 High Your boiler's internal temperature sensor is failing to provide a correct reading, preventing the heating from starting up safely.
E2 222 High Your boiler has detected an electrical fault with the internal sensor that monitors the temperature of the water leaving the unit, preventing it from heating up safely.
E2 233 High Your boiler has lost communication with the internal thermometer that monitors water temperature, causing the system to shut down for safety.
E2 350 High Your boiler has detected a fault with the sensor that monitors the water temperature leaving the unit, causing it to shut down for safety.
E2 351 High Your boiler has lost its connection to the component that monitors water temperature, meaning it cannot safely heat your home or water until the connection is restored.
E9 High Your boiler has shut down because it has detected an unsafe build-up of heat or a lack of water circulation within the internal system.
E9 224 High Your boiler has overheated, prompting a safety sensor to shut the system down to prevent damage.
E9 276 High Your boiler has shut down because the water inside it has become dangerously hot.
EA High Your boiler is failing to light the flame needed to heat your water or radiators, causing the system to shut down for safety.
EA 227 High Your boiler is failing to detect a flame when it tries to start, which means it will not provide any heating or hot water until the issue is resolved.
EA 229 High Your boiler has lost its flame suddenly while it was running, causing it to stop heating your home for safety.
EA 261 High Your boiler's internal computer brain has encountered a communication error and is preventing the system from starting for safety.
EH 258 High Your boiler's internal computer or control module has developed a fault and can no longer communicate with the rest of the system.
F0 High Your boiler's internal computer has encountered a glitch or a hardware failure and can no longer communicate with the rest of the system.
F0 238 High Your boiler has detected an internal electrical problem with the component that controls the gas supply, causing the system to shut down for safety.
F0 239 High Your boiler's internal computer has encountered a critical communication error and cannot safely operate your heating or hot water.
F0 242 High Your boiler's internal computer has encountered a critical communication error and cannot operate safely.
F0 258 High Your boiler's internal computer has encountered a critical communication failure or hardware fault, meaning it cannot process commands to heat your home.
F0 262 High Your boiler's main internal computer or its configuration chip has developed a fault and can no longer communicate correctly with the rest of the system.
F0 272 High Your boiler's internal computer has encountered a critical communication error and cannot tell the system to start heating.
F0 280 High Your boiler's internal computer has encountered a critical error or is not communicating properly, meaning the system cannot run.
F0 290 High Your boiler’s internal computer has lost contact with a vital control chip, meaning the system cannot run safely and will stay locked out.
F1 259 High Your boiler's main internal computer or its configuration module has developed a communication failure, preventing the system from operating safely.
F1 263 High Your boiler's internal computer has developed a fault and can no longer communicate with the main control system, meaning it cannot operate safely.
F7 Emergency Your boiler thinks it can still see a flame inside even though it has been told to turn off.
F7 228 High Your boiler detects a flame when there shouldn't be one, so it has shut down as a safety precaution to prevent gas from flowing incorrectly.
FA Emergency Your boiler is still detecting a flame even though it has tried to turn the gas off, which is a safety conflict that requires a professional inspection.
FA 306 Emergency Your boiler is still detecting a flame even though the gas supply should have been cut off, which is a safety concern that prevents the unit from operating.
FD Low Your boiler has entered a temporary status because the reset button was held down for too long or pressed by mistake.
FD 231 High Your boiler has lost power or experienced an electrical error while it was already trying to show a different fault code.

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