Truma Combi error code W 255 H
CP Plus thermostat lost communication with Combi PCB
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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- Truma Combi Service HandbookTruma
- Truma Combi Service Handbook (TrumaCorp, 20 pp; technician training handbook with Common Error Codes table and per-code Further Details sections) (rv-tech-resources/58-truma-combi-hydronic/Truma-Combi-Service-Handbook_TrumaCorp_20pp.pdf)
- Truma Combi 4 / 6 / 4E / 6E / D6 Operating + Installation Instructions
- Truma Corp 1-855-558-7862 (Elkhart IN)
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