IPX4D High

Main IPX4D Fault Code

The Main IPX4D fault code means: this code indicates that your boiler has detected a potential issue with its weatherproofing or electrical integrity, meaning it has automatically shut down to prevent a short circuit or damage.. It appears on 1 Main 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: Electrical Protection
Typical repair cost £120-250 (including labour)

Engineer required

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

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Main models that show the IPX4D fault code

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

Source

Main IPX4D fault code information on this page is sourced and cross-checked against the official Main service / installation manuals for each affected model.

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