IPX5D Low

Main IPX5D Fault Code

The Main IPX5D fault code means: this code is not actually an error message, but an official label on your boiler casing indicating that the unit is built to withstand water splashes and humidity.. It appears on 2 Main models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Degree of protection against humidity (EN 60529)

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 IPX5D fault code

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

Source

Main IPX5D 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