What does the Alpha 28 fault code mean?

Your boiler's internal air extraction system is failing, which prevents it from safely igniting and providing heating or hot water.

How much does it cost to fix Alpha error code 28?

Typical repair cost for the Alpha 28 fault is £150-300 including labour.

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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.

Six most common causes of dropping pressure.

Each noise points to a different fault.