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Shari YatesJul 30, 2025
What to do if my Vaillant atmoMAG 4/1 Z won't start and the ignition flame doesn't ignite?
- PPatrick FergusonJul 31, 2025
If your Vaillant Boiler fails to start and the ignition flame doesn't ignite, it could be due to several reasons. First, ensure that the gas supply is uninterrupted by checking that the isolation valve on the gas connection is open and, if using liquefied petroleum gas, replace any empty gas cylinder with a full one. Another potential cause is air in the gas supply line; try opening and closing the water tap several times to remove any trapped air. Lastly, a defective safety cut-out or flue gas sensor could be the issue. In this case, you should check these components and replace any that are defective.
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