BoilerFaultCodesIdeal 52 Fault Code
The Ideal 52 fault code means: your boiler has managed to light the small pilot flame, but the main gas burners are failing to ignite to heat your home.. It appears on 5 Ideal models in our database.
Technical description: PILOT LIT BUT NO MAINS GAS
What causes the Ideal 52 fault?
This fault occurs when the boiler successfully lights the small starter flame but cannot open the main gas valve to fire up the large burners. The most common reason is a mechanical failure within the internal gas control valve or an electrical fault in the circuit board that prevents it from sending the signal to release the main flow of gas.
This issue is more frequent in winter when the boiler is under high demand, as internal mechanical parts are more likely to seize after being inactive during the summer.
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 52 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 52 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