What are the common causes of a main boiler error 133?

By: USER7549
27 Agustus 2025 Support 5 minutes
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Grade: Education Subject: Support
What are the common causes of a main boiler error 133?
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Common causes include a faulty gas supply (low pressure, blockage), problems with the ignition system (electrode issues, ignition module failure), issues with the flame sensor (dirty, faulty), a blocked flue, or insufficient airflow to the burner.
Answered on 27 Agustus 2025

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