Samsung Mini Split C422 Error Code

Updated 2026-08-30 · review status: manual-verified · reviewed by MiniSplitDecoder Editorial Team Last verified: 2026-08-30

Check your model first

  • Samsung C-series ductless (WindFree Premium R-32 and related)
  • Samsung DVM S / DVM S2 VRF (E422)
  • Samsung official SG-E422 ODU service guide
  • ACPSA (Samsung DVM distributor bulletin)
  • Samsung WindFree Premium R-32 manual (via SplitAtlas)

Match the model on your equipment label to the linked manufacturer documentation. The same code can mean different things across model families.

Quick answer

C422 (E422) is an EEV / valve error - on Samsung's own service guide it means EEV 1 in the outdoor unit cannot fully open. Clean filters and one breaker reset are safe DIY; EEV, charge, and sensor work is technician-only.

Severity: high · DIY difficulty: easy

Safety

Stop at the breaker power-cycle and any plug-accessible checks (filters, remote settings, visible wiring). The outdoor unit's capacitor holds a lethal charge and the refrigerant circuit is both pressurized and (on R-32 units) flammable — opening panels or servicing the sealed system is licensed-technician work (EPA 608).

What C422 means

C422 means an EEV (electronic expansion valve) fault. Samsung's official service guide SG-E422 defines it as 'EEV 1 in outdoor unit cannot fully open'. SplitAtlas's WindFree Premium table words it as 'EEV or valve close error (self-diagnosis)', and ACPSA (Samsung DVM distributor) describes the detection: the indoor evaporator inlet sensor sees no or abnormal temperature change after 5 minutes of cooling - pointing mainly to the EEV, but also possibly charge or that sensor.

Code meaning varies by series

  • Samsung official SG-E422 ODU service guide: EEV 1 in outdoor unit cannot fully open (EEV open error)
  • ACPSA (Samsung DVM distributor bulletin): Evaporator inlet sensor detects no/abnormal temperature change 5 min into cooling - EEV, refrigerant charge, or evaporator inlet sensor
  • Samsung WindFree Premium R-32 manual (via SplitAtlas): EEV or valve close error (self-diagnosis)

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.

Related codes

Cross-references for the same fault family, by brand:

Samsung C416 · Samsung C440 · Samsung C554

Commonly searched as: "samsung c422" · "samsung error code c422" · "samsung air conditioner c422"

Sources

Related Mini Split guides

Mini-Split Communication Error: DIY Checks · Mini-Split Flashing Light Decoder: Blink Patterns · Mini-Split Maintenance Checklist: Seasonal DIY Tasks · Mini-Split Not Cooling: Ranked Causes and DIY Checks