3 SH Moderate Moderate DIY

Frigidaire Refrigerator 3 SH — Evaporator Sensor Shorted

Frigidaire Refrigerator · Error code 3 SH

What 3 SH Means

Evaporator coil thermistor is reading short circuit. Used by the board to terminate defrost cycles.

Symptoms

  • 3 SH displayed
  • Defrost cycles too short or skipped
  • Frost buildup on evaporator
  • Reduced cooling over time

Common Causes

1
Shorted evaporator thermistor

Sensor failed closed.

2
Wiring short

Wire grounded against the coil bracket.

3
Moisture damage

Sensor mounted on cold coil sees condensation.

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.

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.

Common replacement Evaporator thermistor View on 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 →

Verified against manufacturer documentation: frigidaire.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.