What does the Alpha E20 fault code mean?

Your boiler has stopped heating because it is struggling to keep the flame lit, which means you currently have no heating or hot water.

How much does it cost to fix Alpha error code E20?

Typical repair cost for the Alpha E20 fault is £120-250 including labour.

Check if other gas appliances, like a hob, are working to ensure gas is reaching the property.

Flame signal loss

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Almost always a stuck diverter valve on combis.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.