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Truma Combi 4/6 E (older boards, pre-CP Plus) error code 206

FaultHydronic HeatVerified against the manufacturer's manual

Combi 4/6 E: dirty supply voltage (AC components in power supply)

What to check, and in what order, is in the app. The flow Truma Combi — 12V Supply Diagnostic walks this code step by step with the pass/fail measurements, wiring schematics and procedures that go with it, and it works offline in the bay.

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