BoilerFaultCodesWorcester Bosch D4 213 Fault Code
Also written as D4213 — same fault.
The Worcester Bosch D4 213 fault code means: your boiler has detected that the water inside is heating up too quickly, which usually means the water isn't circulating properly and triggered a safety shut-off.. It appears on 9 Worcester Bosch models in our database.
Technical description: The actual temperature recorded by the flow temperature sensor or return temperature sensor is rising too quickly
DIY fix possible
Check that your boiler pressure is between 1 and 1.5 bar on the pressure gauge.Ensure all radiator valves and the boiler's isolation valves are fully open.Bleed your radiators to remove any trapped air that might be blocking water flow.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Worcester Bosch models that show the D4 213 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch D4 213 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026