BoilerFaultCodesIdeal Detection Fault Fault Code
Also written as DETECTIONFAULT — same fault.
The Ideal Detection Fault fault code means: your boiler has tried to start up several times but cannot establish a stable flame to begin heating.. It appears on 3 Ideal models in our database.
Technical description: Displayed if the boiler fails to light after 5 attempts
What causes the Ideal Detection Fault fault?
This fault occurs when the boiler's control system cannot confirm that a flame has successfully ignited after five attempts. It is usually caused by a worn-out ignition component that fails to create a spark or a faulty sensor that cannot detect the heat of the fire, leading the boiler to shut down for safety. In some cases, it may also indicate that gas is not reaching the burner at the correct pressure.
This fault is more frequent during the first cold snap of autumn when internal components that have been dormant all summer struggle to operate correctly upon restart.
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 Detection Fault fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Ideal Detection Fault fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.
- Ideal Concord CXA 40-120 manual (PDF)
- Ideal Concord CXC 48 116 manual (PDF)
- Ideal Concord Cxdi manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026