E22 High

Ariston E22 Fault Code

The Ariston E22 fault code means: your boiler is struggling because the electrical supply to the unit is unstable or incorrect, preventing it from running safely.. It appears on 5 Ariston 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: Problem with the 50Hz power supply
Typical repair cost £100-£350 (including labour)

DIY fix possible

Turn the boiler off at the fused spur switchWait for 60 secondsTurn the power back on and press the Reset button

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Ariston models that show the E22 fault code

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

Source

Ariston E22 fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026