BoilerFaultCodesWorcester Bosch FAIL POINT D Fault Code
Also written as FAILPOINTD — same fault.
The Worcester Bosch FAIL POINT D fault code means: your boiler is not reacting when you turn on the heating because it isn't receiving the correct signal to start that specific mode.. It appears on 1 Worcester Bosch model in our database.
Technical description: No red light (other lights function in other modes) - CH Mode
What causes the Worcester Bosch FAIL POINT D fault?
This fault occurs when the boiler fails to receive the electrical signal telling it to provide central heating, even though the hot water might still be working. The most common reason is a communication failure from your external room thermostat or a worn-out internal switch that is responsible for toggling the boiler into heating mode.
This issue is most frequently noticed during the first cold spell of autumn when homeowners attempt to switch their heating on for the first time after the summer break.
DIY fix possible
Check that the room thermostat is turned up higher than the current room temperature.Ensure the mechanical clock or digital programmer is set to 'ON' or 'AUTO'.Replace the batteries in your wireless room thermostat if it has them.
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Worcester Bosch models that show the FAIL POINT D fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch FAIL POINT D 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 7 July 2026