BoilerFaultCodesWorcester Bosch F0 242 Fault Code
Also written as F0242 — same fault.
The Worcester Bosch F0 242 fault code means: your boiler's internal computer has encountered a major electronic communication fault, meaning it cannot process the commands needed to heat your home.. It appears on 9 Worcester Bosch models in our database.
Technical description: Control box or the heat control module (HCM) is defective – the HCM and control box connections need to be checked
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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 F0 242 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Worcester Bosch F0 242 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