BoilerFaultCodesIdeal 4.14 Fault Code
Also written as 414 — same fault.
The Ideal 4.14 fault code means: your boiler is providing hot water to your cylinder correctly, but the central heating for your radiators is not working.. It appears on 8 Ideal models in our database.
Technical description: No CH But Cylinder Temperature Ok
What causes the Ideal 4.14 fault?
This fault occurs when the boiler receives a signal to heat your hot water tank successfully, but the separate command to turn on your radiators is failing to reach the system. The most common reason is a faulty motorized zone valve that is stuck or a room thermostat that isn't communicating with the boiler. Because the boiler itself is working fine for hot water, the issue almost always lies with these external controls rather than the internal parts of the boiler.
This issue is frequently identified during the first cold spell of autumn when homeowners switch their heating back on after months of only using the boiler for hot water.
DIY fix possible
Check that your room thermostat or heating programmer is turned up and calling for heatEnsure any zone valves (usually found in the airing cupboard) are moving correctlyReset the boiler by turning the control knob to 'Reset' and then back to the original position
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Gas Safe Register →Ideal models that show the 4.14 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal 4.14 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