BoilerFaultCodesVokera E090 Fault Code
The Vokera E090 fault code means: your boiler has sensed that the exhaust fumes are getting too hot and has shut down as a safety precaution to prevent damage.. It appears on 12 Vokera models in our database.
Technical description: fault flue gases probe / flue gases overtemperature probe
What causes the Vokera E090 fault?
This fault occurs when the internal temperature of the exhaust gases exceeds safe limits, potentially causing damage to the boiler's internal plastics. The most common reasons are a build-up of debris or limescale inside the heat exchanger, which prevents heat from transferring to the water, or a failure of the internal insulation panels meant to contain the burner's heat.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Vokera models that show the E090 fault code
Click a model for the full fault code list and model-specific repair notes.
- Evolve Repair: £120-£350
- Evolve S Repair: £120-250
- Pinnacle Combi Repair: £120-£200
- Pinnacle System Repair: £120-240
- Synergy Combi Repair: £120-£220
- Synergy System Repair: £120-£220
- Unica MAX Repair: £150-250
- Unica MAX Combi Repair: £120-£280
- Unica MAX System Repair: £140-£280
- Vision Plus 35C/40C Repair: £120-200
- Vision S Repair: £120-220
- Vision System Sgc Repair: £120-220
Source
Vokera E090 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 7 July 2026