E 99 High

Warmhaus E 99 Fault Code

Also written as E99 — same fault.

The Warmhaus E 99 fault code means: your boiler has encountered a general internal system error that it cannot automatically resolve, and it requires a professional reset or diagnostic check.. It appears on 1 Warmhaus 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: Generic fault
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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Warmhaus models that show the E 99 fault code

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

Source

Warmhaus E 99 fault code information on this page is sourced and cross-checked against the official Warmhaus service / installation manuals for each affected model.

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