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Samsung Heat pump fault E203

Communication error between INVERTER and MAIN MICOM (6 min)

Heat pump

What it means

Communication error persisting for 6 minutes between the inverter and main microcomputer.

Likely causes

  1. Faulty inverter PCB
  2. Faulty main micom communication circuit
  3. Wiring fault between inverter and main PCB
  4. Damaged wiring

Where to start

  1. Check for visible damage to wiring
  2. Inspect connectors for corrosion

The full answer, free

  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 83), 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 Samsung manual for the Heat pump. Check the model on the data plate before you order parts.

Other Samsung Heat pump fault codes