What does the ECA 353 fault code mean?

Your boiler has lost communication with a key temperature sensor, causing it to shut down for safety reasons to prevent overheating.

How much does it cost to fix ECA error code 353?

Typical repair cost for the ECA 353 fault is £120-200 including labour.

Manufacturer manual

B10 sensor lost

From this model's manual

Verified against the Eca/Eca Felis Fl 50 Hm installation & service manual, page 62.

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

Boiler cover options

A cover plan would handle faults like 353: no call-out fees, no surprise bills.

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Seeing a different code? Every code this model can display, in one place.

Lockout fault with a reset-needed pattern.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.