How much does it cost to fix Alpha error code E13?

Typical repair cost for the Alpha E13 fault is £100-£280 including labour.

E13 High

Alpha E13 Fault Code

Q: What does the Alpha E13 fault code mean?

Your boiler has detected that the water returning from your radiators is getting too hot, usually because the water isn't circulating properly through the system.

The Alpha E13 fault code means: your boiler has detected that the water returning from your radiators is getting too hot, usually because the water isn't circulating properly through the system.. It appears on 1 Alpha model in our database.

Technical description: Heating return NTC sensor temperature too high

Typical repair cost £100-£280 (including labour)

DIY fix possible

Check that at least two or three radiators have their valves turned fully openEnsure your central heating pump is running and not stuckTry resetting the boiler to see if the fault clears

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Alpha models that show the E13 fault code

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

CD24 Repair: £100-£280

Source

Alpha E13 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 27 April 2026