R-Pro › Field cases › Air conditioning
Inverter Error Code — Refer to Manufacturer Manual
Likely causes
Communication error (indoor/outdoor unit wiring fault)
Check: Look up error code in manufacturer service manual
What to do: Look up error code in manufacturer service manual → Communication error: check continuity of indoor-outdoor communication wiring → Sensor error: measure sensor resistance (compare with temp-resistance chart) → IGBT error: clean inverter cooling fin and restart → Replace inverter module if error repeats
Sensor failure (temperature or pressure sensor open)
Check: Communication error: check continuity of indoor-outdoor communication wiring
What to do: Communication error: check continuity of indoor-outdoor communication wiring → Sensor error: measure sensor resistance (compare with temp-resistance chart) → IGBT error: clean inverter cooling fin and restart → Replace inverter module if error repeats
IGBT module overheating or failure
Check: Sensor error: measure sensor resistance (compare with temp-resistance chart)
What to do: Sensor error: measure sensor resistance (compare with temp-resistance chart) → IGBT error: clean inverter cooling fin and restart → Replace inverter module if error repeats
Error code meanings vary by manufacturer. Look up the code in the manual and follow the indicated checks. High-voltage capacitors inside the inverter take 10+ minutes to discharge after power-off. Do not touch internals immediately.
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