Vaillant F28 Error Code

Vaillant F28 Error Code

Fixing the Vaillant boiler F28 Error

Encountering the F28 error on your Vaillant boiler? Learn about the causes and possible solutions below.

F28 Error on Vaillant Boilers: Common Models and Occurrence
The F28 code appears after 3 failed ignition attempts on Vaillant Ecotec Pro Plus and Turbomax Plus 824/828E.

Don’t Restart: Understanding ‘Lockout’ Mode
Turning the boiler on and off won’t work then call a Gas Safe engineer for safety.

Root Causes of F28 Error and How to Fix Them
Gas valve faults, wiring issues, condensate blockage, faulty electrodes, or gas supply problems.

Gas Valve:
Check wiring and valve function. Repairs may cost around £100, replacement up to £300.
Printed Circuit Board (PCB): The backbone of electrical components. Repair or replacement can cost up to £500.
Condensate Blockage: Defrost the pipe for £50-100 or use newer boilers with CondenseSure.
Faulty Electrodes: Check and replace if needed, might cost several hundred pounds.
No Gas Supply: Verify gas supply by checking other gas appliances.


Understanding the F28 error on your Vaillant boiler and its possible causes can help you address the issue promptly. For complex problems, always seek assistance from a qualified Gas Safe engineer. Trust Ignite My Boiler for reliable heating solutions

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