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Vaillant ecoTEC Plus showing F28 error code. No hot water or heating.
F28 is an ignition failure. The boiler has tried to light and failed. Most common causes:
- •Gas supply interrupted — check the gas meter and other appliances
- •Ignition leads or electrode worn — inspect for cracks or carbon build-up
- •Gas valve fault — check valve operation with a manometer
Gas supply is fine. Electrode looks clean. What else should I check?
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