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Midea M-Thermal Arctic HT R290 Mono fault L34

Inverter module protection code (digital display L34)

Heat pump

What it means

Inverter module protection code displayed as L34 on digital display panel. Specific description not detailed in this manual window.

Likely causes

  1. Missing or disconnected phase on power supply
  2. Wiring fault
  3. Faulty inverter power module
  4. Faulty three-phase bridge rectifier (3Ph models)

Where to start

  1. Check specific L** code on digital display panel on the Main Control PCB
  2. Verify all three phases present on power supply
  3. Refer to Part 4 Appendix: Guide for identifying inverter PCB failure to determine PCB status before component replacement

The full answer, free

  • 7 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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