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Midea R32 M thermal Arctic Mono fault L5

Zero speed protection

Heat pump

What it means

Zero speed protection detected by refrigerant system main PCB. Displayed as P6/H4 on user interface.

Likely causes

  1. Compressor not reaching minimum speed
  2. Wire not connected properly
  3. Inverter module PCB malfunctioned
  4. Compressor failure
  5. Zero speed protection
  6. Compressor not rotating
  7. Motor stall
  8. Discharge temperature exceeding 105°C indicating high compressor load or high ambient/system conditions
  9. Compressor current exceeding Currentmax threshold

Where to start

  1. Check LED301 flashing pattern on inverter module. L5 error shows 13 flashes and stops for 1 second, then repeats with LED302 always on red
  2. Check if the wire is connected properly
  3. Check if inverter module PCB has malfunctioned

The full answer, free

  • 17 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 67), 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 R32 M thermal Arctic Mono. Check the model on the data plate before you order parts.

Other Midea R32 M thermal Arctic Mono fault codes