Samsung Mini Split C474 Error Code

What C474 means

C474 is generation-dependent on Samsung RAC mini splits. Official Samsung service documentation maps C474 to Heat sink sensor error - open/short on the inverter heatsink temperature sensor; SplitAtlas, presenting the current R-32 residential mapping, reads C474 as an Input current sensor error, with a technician note to verify input current sensor placement, resistance, connector condition, harness continuity and PBA input before replacing parts.

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.