0 2. High

Remeha 0 2. Fault Code

Also written as 02 — same fault.

The Remeha 0 2. fault code means: your boiler is failing to light or cannot detect the flame, meaning it has shut down to prevent unburned gas from building up.. It appears on 3 Remeha models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: No flame or no ionisation (after 3 starts): a. no ignition spark (visible through inspection glass). Check: connection of ignition cable and spark plug cap; ignition cable and electrode for breakdown; electrode distance; must be 3-4 mm. b. ignition spark, but no flame. Check if: gas cock is open; inlet gas pressure is sufficient; gas pipe is vented; gas valve is energized during ignition; electrode is fitted properly; the gas/air ratio is not correct; the gas pipe is not clogged or shows an assembly fault. c. flame, but no ionisation.

What causes the Remeha 0 2. fault?

This fault happens because the boiler has attempted to light three times but failed to establish or detect a steady flame. It is usually caused by a worn-out ignition spark or a problem with the gas supply reaching the burner. Without a confirmed flame, the boiler shuts down as a safety measure to prevent unburned gas from accumulating inside the unit.

This issue is more frequent during the first cold snap of autumn when internal components that have been idle over summer fail to operate correctly upon restart.

Typical repair cost £120-350 (including labour)

DIY fix possible

Check that your gas emergency control valve and any internal gas lever valves are fully open.Verify if other gas appliances in your home, such as a hob, are working to confirm gas supply.If you have a prepayment meter, ensure you have sufficient credit.Press the reset button on the control panel once to see if the boiler restarts.

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Remeha models that show the 0 2. fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Remeha 0 2. fault code information on this page is sourced and cross-checked against the official Remeha service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026