E00 High

Alpha E00 Fault Code

The Alpha E00 fault code means: your boiler has lost its connection to the power supply or the main control board has experienced a temporary communication error.. It appears on 1 Alpha 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: 5635540 696
Typical repair cost £100-350 (including labour)

DIY fix possible

Check if other electrical appliances in your home are workingCheck your fuse box to ensure the boiler circuit hasn't trippedSwitch the boiler power off and back on again to attempt a reset

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Alpha models that show the E00 fault code

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

Source

Alpha E00 fault code information on this page is sourced and cross-checked against the official Alpha service / installation manuals for each affected model.

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