Truma Combi error code W 17 H
Summer mode active with empty water container (boiler/DHW tank not filled). Heater pauses to prevent dry-fire damage.
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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- Truma CP Plus Operating Instructions EN (Truma KG, 21 pp; canonical Gen-4 W/E + H-suffix Combi gas control panel reference) (rv-tech-resources/58-truma-combi-hydronic/Truma_CP_Plus_Operating_Instructions_EN_21pp.pdf)
- Truma Combi 4 / 6 / 4E / 6E / D6 Operating + Installation Instructions
- Truma Corp 1-855-558-7862 (Elkhart IN)