BoilerFaultCodesVokera 04 Fault Code
The Vokera 04 fault code means: your boiler has failed to ignite or stay lit after several attempts and requires a manual reset and investigation by a professional.. It appears on 13 Vokera models in our database.
Technical description: Final fault code (Refer to section 7.11)
What causes the Vokera 04 fault?
This fault occurs when the boiler's control system attempts to start the burner multiple times but cannot confirm that a stable flame has been established. The most common reasons include a lack of gas supply to the unit, a worn-out ignition spark, or a sensor that can no longer detect the heat of the flame. It essentially acts as a safety shutdown to prevent unburnt gas from building up inside the appliance.
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 →Vokera models that show the 04 fault code
Click a model for the full fault code list and model-specific repair notes.
- Easi-Heat 25 Repair: £100-£250
- Easi-Heat 29 Repair: £100-£250
- Linea 24 Repair: £0-120
- Linea 28 Repair: £60-140
- Linea 7 Repair: £60-140
- Linea HE Repair: £100-£250
- Linea Max Repair: £60-220
- Linea Plus AG Repair: £0-120
- Mynute 28E / 35E Repair: £0-160
- Synergy E Repair: £0-120
- Syntesi 25 Repair: £0-120
- Syntesi 29 Repair: £0-120
- Syntesi E Repair: £0-120
Source
Vokera 04 fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026