Ideal Sprint Fault codes & diagnostics

5 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural Gas 24 kW 1997-2005 Discontinued

Replaced by: Icos

Download the Ideal Sprint manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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Just want the most common Ideal Sprint faults?

The top 6 problems in plain English — with causes, DIY checks and repair costs.

Fault codes

All 5 documented codes

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What to check first

Locate the filling loop, which is usually a flexible silver hose with small lever valves under the boiler.
Slowly open both lever valves until you hear water flowing and watch the pressure gauge.
Close both valves tightly once the pressure gauge reaches between 1 and 1.5 bar.

Parts commonly replaced

Filling loop
Pressure sensor
Expansion vessel

Related codes

F2
L1

Parts commonly replaced

Flow thermistor
Return thermistor
Pump
Main PCB

Related codes

What to check first

Check that all radiator valves are fully open
Ensure your boiler pressure is between 1.0 and 1.5 bar
Press the reset button on the front of the boiler

Parts commonly replaced

Circulating Pump
Thermistor (Temperature Sensor)
Heat Exchanger

Related codes

L2
F1

What to check first

Check that your gas pre-pay meter has credit (if applicable)
Check that other gas appliances like your hob are working to ensure gas is reaching the property
Press the Reset button or turn the control knob to 'Reset' then back to 'On/Service'

Parts commonly replaced

Ignition Electrode
Flame Sensing Probe
Gas Valve
PCB

Related codes

L1
F2

What to check first

Switch off the boiler and allow the system to cool down completely.
Locate the filling loop (the flexible silver hose) underneath the boiler.
Open the small valve handles slowly until you hear water flowing and the gauge reaches 1.0 - 1.5 bar.
Close the valves tightly and restart the boiler.

Parts commonly replaced

Filling loop
Expansion vessel
Pressure relief valve

Related codes

F1

Status & diagnostic codes

24 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

11 Diagnostic Your boiler has detected that the water temperature has risen too high and it has automatically shut down to prevent damage. 11.7 Diagnostic Your boiler is failing to light because it is not detecting the necessary water pressure, which is preventing the system from starting safely. 13 Diagnostic Your boiler has detected a communication error with its internal computer, meaning it cannot safely operate or control the heating and hot water functions. 14.6 Diagnostic Your boiler has detected that the water pressure inside the heating system is too low to operate safely. 15.2 Diagnostic Your boiler is not detecting the burner flame correctly, so it has safely shut itself down to prevent gas from flowing without ignition. 17.6 Diagnostic Your boiler has detected an issue with the electrical signal coming from the gas valve, which prevents it from igniting safely. 19.0 Diagnostic Your boiler has detected an issue with the sensor that monitors the temperature of the water inside the unit, causing it to stop operating for safety reasons. 20 Diagnostic Your boiler has detected a problem with the temperature sensor, meaning it cannot safely regulate how hot the water gets, so it has shut down to prevent overheating. 22.0 Diagnostic Your boiler is not firing because it cannot detect any water flowing through the system. 22.8 Diagnostic Your boiler has identified that the internal water pressure is too low to operate safely, preventing it from heating your home or water. 23 Diagnostic Your boiler is not firing because it has detected an issue with the water flow or temperature readings, preventing it from safely heating your home. 24.7 Diagnostic Your boiler is failing to detect that it has successfully lit or is experiencing a flame failure shortly after starting. 82 Diagnostic Your boiler is not communicating correctly with its internal control system, meaning it has safely shut down to prevent incorrect operation. 95 Diagnostic Your boiler has detected an internal communication or hardware issue that is preventing it from starting up correctly. 125 Diagnostic Your boiler has detected that the water is not circulating properly through the system, meaning it cannot safely heat your home or tap water. 160 Diagnostic Your boiler has detected a problem with the fan that pushes air and exhaust gases through the system, meaning it cannot operate safely. 200 Diagnostic Your boiler has detected an internal communication failure, meaning the main control board is unable to talk to other parts of the system to operate correctly. 204 Diagnostic Your boiler is failing to light because it cannot detect a flame, likely due to a combustion or ignition problem. 235 Diagnostic Your boiler is failing to light because it is struggling to detect a flame or sustain combustion, resulting in a total loss of heating and hot water. 250 Diagnostic Your boiler has failed to ignite or stay lit, meaning it cannot produce heating or hot water. 300 Diagnostic Your boiler's internal communication system is failing, meaning it cannot properly coordinate its safety and operational functions. 315 Diagnostic Your boiler has detected an issue with the main control board's software or communication, preventing it from operating correctly. 326 Diagnostic Your boiler's electronic brain is detecting an internal communication error, meaning it has safely shut itself down to prevent operation with incorrect settings. 400 Diagnostic Your boiler has stopped working because it has detected an issue with the internal electronics or the communication between the boiler's control systems.