What should I do if I'm unsure about how to fix an E117 error code?

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Grade: Education Subject: Support
What should I do if I'm unsure about how to fix an E117 error code?
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The safest course of action is to call a qualified heating engineer. Attempting to fix the problem yourself without the necessary knowledge or tools can be dangerous and could void your warranty. A professional can accurately diagnose the problem and provide a reliable repair.