What does the Alpha 27 fault code mean?

Your boiler is struggling to move water around the system correctly, which is causing it to shut down to prevent overheating.

How much does it cost to fix Alpha error code 27?

Typical repair cost for the Alpha 27 fault is £100-£350 including labour.

Check that your boiler pressure is between 1.0 and 1.5 bar on the gauge; top up if it is low.

Insufficient primary flow

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

Each noise points to a different fault.

Sludge build-up — needs flushing, not bleeding.

Almost always a stuck diverter valve on combis.