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Midea M-Thermal Arctic HT R290 Mono fault L5E

Inverter module protection code

Heat pump

What it means

Inverter module protection code shown on digital display; specific description not detailed in this section beyond code table image.

Likely causes

  1. Faulty inverter power module
  2. Faulty three-phase bridge rectifier (3Ph models)

Where to start

  1. Refer to Part 4 Appendix: Guide for identifying inverter PCB failure to determine PCB status before component replacement
  2. Set multimeter to diode test function (secondary tube available)
  3. For 1Ph models, test inverter circuit test points only

The full answer, free

  • 5 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 147), right under the answer
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Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the Midea manual for the M-Thermal Arctic HT R290 Mono. Check the model on the data plate before you order parts.

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