How much does it cost to fix Worcester Bosch error code Fd 231?

Typical repair cost for the Worcester Bosch Fd 231 fault is £120-250 including labour.

Fd 231 High

Worcester Bosch Fd 231 Fault Code

Q: What does the Worcester Bosch Fd 231 fault code mean?

Your boiler has detected a temporary loss of electrical power or a loose internal connection, causing it to shut down for safety.

Also written as FD231 — same fault.

The Worcester Bosch Fd 231 fault code means: your boiler has detected a temporary loss of electrical power or a loose internal connection, causing it to shut down for safety.. It appears on 6 Worcester Bosch models in our database.

Technical description: Electrical interruption fault

Typical repair cost £120-250 (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 →

Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like Fd 231: no call-out fees, no surprise bills.

Approved partner

Domestic Appliance Guard

Unlimited call-outs, 24/7 helpline, no price-hike promise

Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Worcester Bosch models that show the Fd 231 fault code

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

Source

Worcester Bosch Fd 231 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 7 July 2026