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Heating Fault Decision Tree (Core Diagnostic Flow): Revision history

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10 June 2026

  • curprev 14:3914:39, 10 June 2026 Morgan Allen talk contribs 1,254 bytes +1,254 Created page with "= Heating Fault Decision Tree = == Purpose == To quickly identify whether a heating fault is caused by controls, wiring, or the boiler itself. --- == Step 1: Identify Symptom == * No heating at all * No hot water * Intermittent heating * Heating stuck ON * Boiler not firing --- == Step 2: Check Demand Exists == * Raise room thermostat above ambient temperature * Check programmer is calling for heating/hot water * Observe: ** Valve movement ** Relay clicks ** Boiler..."
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