What does the Ariston 50 (ll) fault code mean?

Your boiler is struggling to move water through the system, either because the flow is blocked or the internal pump is not working correctly.

How much does it cost to fix Ariston error code 50 (ll)?

Typical repair cost for the Ariston 50 (ll) fault is £150-350 including labour.

Primary water circulation defect

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.

Each noise points to a different fault.

Sludge build-up — needs flushing, not bleeding.