Frigidaire · Refrigerator Moderate

3 SH — Temperature Sensor Short

3 SH indicates a temperature sensor reading a short circuit (the "SH" suffix means shorted). Frigidaire uses the leading digit to identify which sensor (e.g., 1 SH and 2 SH for the fresh-food and freezer sensors); confirm which sensor the "3" slot maps to for your specific model before replacing it.

Keep using it?
Yes, with caution
DIY difficulty
Moderate
Verified against
frigidaire.com ↗

How to fix it

  1. Unplug refrigerator.
  2. Remove freezer back panel to access evaporator coil and its sensor clip.
  3. Ohm the sensor — replace if shorted.
  4. Inspect harness for shorts to chassis.
  5. Replace main board if sensor and wiring are good.

Why it happens

Typical signs: 3 SH displayed · Defrost cycles too short or skipped · Frost buildup on evaporator · Reduced cooling over time

  • Shorted evaporator thermistor Sensor failed closed.
  • Wiring short Wire grounded against the coil bracket.
  • Moisture damage Sensor mounted on cold coil sees condensation.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • Evaporator thermistor Common replacement
    Amazon →

More Frigidaire refrigerator codes

1F 1F — Ice Maker Fault 1 SH 1 SH — Fresh Food Sensor Shorted 1 SY 1 SY — Fresh Food Sensor Open 2 SH 2 SH — Freezer Sensor Shorted 3 SY 3 SY — Evaporator Sensor Open 4 SY 4 SY — Ambient / Defrost Sensor Open

All Frigidaire codes → All refrigerator codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: frigidaire.com.