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Midea R32 M thermal Arctic Mono fault HD

Communication fault between master unit and slave unit (in cascade)

Heat pump

What it means

Error code 52. Communication fault between master unit and slave unit in cascade configuration, detected by user interface and refrigerant system main PCB.

Likely causes

  1. SW9 DIP switch with wrong settings
  2. More than two units are connected to the wire controller
  3. Power-on interval between master unit and slave unit is longer than 2min
  4. Wire connection error
  5. Communication between units is unstable
  6. Address code missing or address code setting duplicate
  7. Main board fuse is damaged
  8. Communication wiring fault
  9. Cascade configuration issue

Where to start

  1. Check SW9 setting on master and slave units
  2. Verify number of controllers connected to master unit
  3. Check power-on interval timing between master and slave units

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 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