What does the Alpha 0A37 – Pro Tec 50 fault code mean?

Your boiler has detected that water is not circulating through the system quickly enough to prevent overheating, so it has shut down for safety.

How much does it cost to fix Alpha error code 0A37 – Pro Tec 50?

Typical repair cost for the Alpha 0A37 – Pro Tec 50 fault is £120-350 including labour.

Check that all radiator valves are fully open

Insufficient system flow (if the system flow is too low for a certain length of time boiler will switch off)

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.

Lockout fault with a reset-needed pattern.

Sludge build-up — needs flushing, not bleeding.