Truma VarioHeat error code W 255 H
No 12 VDC at heater OR no TIN-bus comms between heater and CP Plus control panel.
What to check, and in what order, is in the app. The flow Truma: Control Panel No Display 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 VarioHeat Operating Instructions (EN)Truma
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