BoilerFaultCodesIdeal 442 Fault Code
The Ideal 442 fault code means: your boiler has experienced a nervous breakdown in its main computer brain, which means it cannot communicate with itself and has stopped working for safety.. It appears on 2 Ideal models in our database.
Technical description: internal failure - electronic
What causes the Ideal 442 fault?
This fault occurs when the boiler's main control board suffers a hardware failure, preventing it from processing instructions or identifying its own components. The most common reason is age-related wear on the delicate electrical circuits or a sudden power surge that has damaged the board's memory.
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 →Ideal models that show the 442 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 442 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026