Truma Combi error code 4 (PCB flash code ssss, slss)
Current for combustion air motor too high. Combustion air motor, cable harness, or PCB fault.
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 Diagnostics Catalogue (canonical 57-code reference, external PDF at leisureshopdirect.com/pdf/370196265.pdf)
- Truma Combi 4 / 6 / Plus / E / D Technician Service Diagnostic Reference (rv-tech-resources/58-truma-combi-hydronic/Truma_Combi_4_6_Plus_E_D_Technician_Service_Diagnostic_Reference.md)
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