Magnum error code Tfmr Overtemp
The transformer Temperature Cut-Out (TCO) opened, shutting the inverter down to protect the power transformer; it auto-restarts when the TCO cools.
What to check, and in what order, is in the app. The flow Magnum: No Output Power, Inverter LED OFF 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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- Magnum_ME-RC_Remote_Owners_Manual_64-0003-H_V2.9.pdf
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