Phase reversed neon High

Warmworld Phase reversed neon Fault Code

Also written as PHASEREVERSEDNEON — same fault.

The Warmworld Phase reversed neon fault code means: your boiler has detected that the electrical wiring coming from your home's power supply is connected back-to-front, which is preventing the system from starting up safely.. It appears on 1 Warmworld model 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: L and N supply are reversed; boiler will not progress beyond pilot ignition.
Typical repair cost £80-140 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Warmworld models that show the Phase reversed neon fault code

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

Source

Warmworld Phase reversed neon fault code information on this page is sourced and cross-checked against the official Warmworld service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026