BoilerFaultCodesIdeal 49 Fault Code
The Ideal 49 fault code means: your boiler has successfully lit its pilot light, but the main burner is failing to ignite because it is not receiving the main supply of gas.. It appears on 3 Ideal models in our database.
Technical description: PILOT LIT BUT NO MAINS GAS
What causes the Ideal 49 fault?
This fault occurs when the boiler successfully lights the small pilot flame but fails to transition to the main burner to heat your home. It is physically caused by a lack of gas flow to the main burner, often due to a faulty gas valve or a blockage in the pilot assembly that prevents the control board from seeing a strong enough signal to release the main gas supply.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Ideal models that show the 49 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 49 fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
- Ideal Mexico CF3 40 & 50 manual (PDF)
- Ideal Mexico Super 100FF / 125FF manual (PDF)
- Ideal Mexico Super CF3 40-80 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026