What does the Vaillant ecoTEC plus F46 fault code mean?
The F46 fault code indicates a problem with the air pressure switch in the Vaillant ecoTEC plus boiler. This switch is crucial for ensuring that the boiler operates safely by monitoring the airflow necessary for combustion.
Common Causes
- Blocked Flue: A blockage in the flue system can prevent proper airflow, leading to the air pressure switch failing to operate correctly.
- Faulty Air Pressure Switch: The switch itself may be defective or malfunctioning, which can cause it to give incorrect readings.
Can I fix it myself? (DIY)
It is highly recommended to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that can be dangerous if handled improperly. Attempting to fix it yourself could void warranties or lead to safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the air pressure switch is around £150 to £200, including parts and labour. This cost reflects the price of the switch itself, which typically ranges from £50 to £100, plus the engineer’s service fee.