A09 error code
Flue sensor fault
What does Vokèra Vokèra gas boilers A09 mean?
Vokèra documents A09 for Vokèra gas boilers as “Flue sensor fault”. This is the quick answer for this product context. Confirm the full code and exact model because the same display can have a different meaning on another range or generation.
The code identifies the condition detected by the product; it does not always identify the failed component on its own. Confirm the full code and exact model before ordering parts or attempting a reset.
The Vokèra Vokèra gas boilers A09 error code indicates vokèra documents A09 for Vokèra gas boilers as “Flue sensor fault”. This is the quick answer for this product context. Confirm the full code and exact model because the same display can have a different meaning on another range or generation. This guide explains what the code means, the symptoms and likely causes, the checks that are safe to make, and when to stop and arrange an authorised repair.
Symptoms you may notice
- The display, app or service panel shows A09.
- Normal operation may pause, lock out or continue with reduced functionality.
- Other symptoms depend on the exact model and the conditions present when the code appeared.
Common causes
- The product detected the condition described as flue sensor fault.
- A connection, sensor, consumable, supply or control issue may be involved.
- Model-specific diagnosis is required before any component is replaced.
Before you start troubleshooting
Use the display, rating label or product menu to confirm the exact model. Similar-looking codes can have different meanings across product generations and regions.
- Record the complete code before switching the equipment off.
- Check only user-accessible controls, filters and external connections described in the manual.
- Do not open gas, refrigerant, combustion or electrical compartments.
Troubleshooting steps
- 1. Record the complete code, model number and what the product was doing.
- 2. Check only user-accessible items described in the operating manual.
- 3. Confirm power, water, ventilation, doors, trays or consumables where relevant.
- 4. Use the model-specific manual before attempting a reset.
- 5. Stop if the code returns or a check requires dismantling the product.
Can you fix this error code yourself?
This fault is not intended for user repair. Do not remove covers or test internal components; record the code and contact an authorised technician.
A successful reset is not proof that the underlying issue is fixed. If A09 reappears, note when it happens and give that information to the service engineer.
Reset instructions
Switch the product off using its normal control, wait as directed by the exact model manual, then restart once. Do not repeatedly reset a returning fault; a reset clears the display but may not correct the cause.
Applicable products and models
Vokèra gas boilersModel dependentCurrent and legacy modelsWhen to contact a professional
Contact a Gas Safe registered engineer if the code returns, the boiler will not operate safely, pressure will not remain stable, or diagnosis requires access inside the casing. Give the engineer the full code and model number.
Frequently asked questions
What does Vokèra Vokèra gas boilers A09 mean?
Vokèra documents A09 for Vokèra gas boilers as “Flue sensor fault”. This is the quick answer for this product context. Confirm the full code and exact model because the same display can have a different meaning on another range or generation.
Can I fix Vokèra Vokèra gas boilers A09 myself?
This code is not classed as user-fixable. Record it and arrange authorised diagnosis rather than opening the product.
Should I reset the product after code A09?
Switch the product off using its normal control, wait as directed by the exact model manual, then restart once. Do not repeatedly reset a returning fault; a reset clears the display but may not correct the cause.
When should I arrange a repair?
Contact a Gas Safe registered engineer if the code returns, the boiler will not operate safely, pressure will not remain stable, or diagnosis requires access inside the casing. Give the engineer the full code and model number.