What does the Worcester Bosch T3 fault code mean?

Your boiler is checking if the pump is moving water correctly but has detected a problem with the flow.

How much does it cost to fix Worcester Bosch error code T3?

Typical repair cost for the Worcester Bosch T3 fault is £180-£350 including labour.

Check that your central heating valves (the ones under the boiler) are fully open

Pump test – checking the basic pump

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.

Safety-critical — turn off, read this.