BoilerFaultCodesIdeal 529 Fault Code
The Ideal 529 fault code means: your boiler has identified a problem with the fan motor, meaning it cannot safely clear waste gases and has shut down to prevent damage.. It appears on 2 Ideal models in our database.
Technical description: Air flow - Fan keeps turning / no tacho signal
What causes the Ideal 529 fault?
This fault occurs when the boiler's control board tries to spin the fan but cannot confirm that it is actually moving or rotating at the correct speed. The most common reasons are a complete mechanical failure of the fan motor or a break in the delicate communication wires that send speed signals back to the main computer. Without this signal, the boiler cannot verify that it is safe to ignite and clear away harmful exhaust gases.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Ideal models that show the 529 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 529 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