How much does it cost to fix Vaillant error code P13?

Typical repair cost for the Vaillant P13 fault is £120-250 including labour.

P13 High

Vaillant P13 Fault Code

Q: What does the Vaillant P13 fault code mean?

Your boiler has detected that it is not correctly set up to run on the specific type of bottled gas you are using.

The Vaillant P13 fault code means: your boiler has detected that it is not correctly set up to run on the specific type of bottled gas you are using.. It appears on 1 Vaillant model in our database.

Technical description: Mid setting point for LPG (G30/31)

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 →

Vaillant models that show the P13 fault code

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

Thermocompact Repair: £120-250

Source

Vaillant P13 fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.

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