Schneider Conext error code F21
Transfer relay welded (an unidentified transfer relay is bad, or an AC source wired directly to the AC output).
What to check, and in what order, is in the app. The flow Coach Electrical — entry diagnostic (converters / inverters / solar / monitors) 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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- Conext XW Inverter/Charger Maintenance (Service) Guide 977-0017-01-01 Rev B (covers XW 6048 / XW 4548 / XW 4024)Schneider Electric
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