Truma Combi (older boards, 4-digit catalogue) error code 0041
Electronics blocked: air or water temp switch opened from overheat OR combustion air sensor >215°C
What to check, and in what order, is in the app. The flow Truma Combi — Heater Overheat / Code 0094 / 0150 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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