A7 808 Medium

Worcester Bosch A7 808 Fault Code

Also written as A7808 — same fault.

The Worcester Bosch A7 808 fault code means: your boiler is struggling to accurately detect the temperature of your hot water, which means it may fail to provide a consistent hot shower or turn the hot water off entirely.. It appears on 1 Worcester Bosch model in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Domestic hot water sensor defect
Typical repair cost £120-220 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Worcester Bosch models that show the A7 808 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Worcester Bosch A7 808 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026