1 SY Serious Moderate DIY

Frigidaire Refrigerator 1 SY — Fresh Food Sensor Open

Frigidaire Refrigerator · Error code 1 SY

What 1 SY Means

Open-circuit reading on the fresh food (Sensor 1) thermistor on Gallery/Professional units.

Symptoms

  • 1 SY displayed
  • Fresh food does not cool to setpoint
  • Temperature display dashes for fresh food

Common Causes

1
Open thermistor element

Sensor has aged out.

2
Broken sensor wire

Conductor severed near sensor body.

3
Unplugged harness

Connector worked loose.

How to Fix It

  1. Unplug refrigerator.
  2. Inspect and reseat fresh food thermistor harness.
  3. Ohm the sensor — replace if open.
  4. Test continuity of sensor wiring back to main board.
  5. Replace main board if input pin is dead.

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 Fresh food thermistor View on Amazon→

More Frigidaire Refrigerator Codes

1F 1F — Ice Maker Fault 1 SH 1 SH — Fresh Food Sensor Shorted 2 SH 2 SH — Freezer Sensor Shorted 3 SH 3 SH — Evaporator 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.