Error codes › Hydronic Heat › Truma Combi (older boards, 4-digit catalogue) › 0150

Truma Combi (older boards, 4-digit catalogue) error code 0150

FaultHydronic HeatVerified against the manufacturer's manual

Fault: air or water temp switch opened 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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