Samsung Mini Split C122 Error Code

What C122 means

C122 means an evaporator sensor fault - the service manual lists C122/C123 as the indoor mid / indoor-in evaporator (EVA-TH) temperature sensor error, matching the E122 evaporator-sensor convention on other Samsung lines. One source (SplitAtlas, WindFree Premium) reads C122 as a motion sensor error instead; models with an AI motion sensor can also flag it, so confirm on your model.

First checks before service

This page currently documents the safe reset triage. If the code returns, use the linked source manual or a qualified technician for code-specific diagnosis.

1. 1. One-time fault event (power disturbance or transient sensor reading) common DIY

   Check: Power-cycle at the breaker/disconnect (or unplug for CPAP), restore, and run the system while watching for the code.

   Fix: If the code does not return after a full run cycle, the fault was transient — monitor, no repair needed.

2. 2. Fault persists after a clean reset occasional pro only

   Check: If the code returns immediately or every session, note the conditions (startup, heating, after rain).

   Fix: A persisting code points at the component the manual assigns to this code — that repair is technician territory.