Flashing orange LED High

Sime Flashing orange LED Fault Code

Also written as FLASHINGORANGELED — same fault.

The Sime Flashing orange LED fault code means: your boiler is struggling to move water through your heating system, which means it has stopped heating your home or water to prevent damage.. It appears on 3 Sime 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 water circulation.
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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Sime models that show the Flashing orange LED fault code

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

Source

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

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