E1 Moderate Moderate DIY

Bosch Refrigerator E1 — Refrigerator Compartment Sensor Fault

Bosch Refrigerator · Error code E1

What E1 Means

The control board has lost a valid signal from the fresh-food (refrigerator) compartment temperature sensor (thermistor). Cooling control defaults to a fail-safe mode and temperatures may drift.

Symptoms

  • E1 shown on display
  • Fridge running too warm or too cold
  • Compressor cycling abnormally
  • Temperature setting will not hold

Common Causes

1
Failed fresh-food thermistor

Sensor reads open or shorted out of spec (should be roughly 5-30k ohms at typical fridge temps).

2
Loose or corroded sensor harness connector

Connector at the sensor or main board has backed out, moisture has corroded pins, or a wire is broken inside the insulation.

3
Damaged wiring in the door hinge or rear channel

Repeated flexing or a pinch during a prior repair can break a conductor.

4
Failed main control board input

Sensor input circuit on the PCB is damaged (less common than a bad sensor).

How to Fix It

  1. Press and hold the alarm/Mute button to silence; note the exact code shown.
  2. Unplug the refrigerator for 5 minutes to attempt a soft reset.
  3. If the code returns, locate the fresh-food thermistor (usually clipped to the rear evaporator cover inside the fridge cavity).
  4. Inspect the harness and connector for moisture, corrosion, or backed-out pins; reseat firmly.
  5. With the unit unplugged, measure thermistor resistance at room temperature against the spec in the tech sheet behind the kick plate.
  6. Replace the thermistor if out of range; if in range and wiring is good, replace the main control board.

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 Bosch refrigerator temperature sensor (thermistor) View on Amazon→ Common replacement Bosch refrigerator main control board View on Amazon→

More Bosch Refrigerator Codes

E10 E10 — Inverter Compressor / Compressor Drive Fault E11 E11 — Condenser Fan Motor Fault E12 E12 — Damper Control Fault E13 E13 — Ice Maker Fault E14 E14 — Filter Reset Reminder E2 E2 — Freezer Compartment Sensor Fault

All Bosch codes → All refrigerator codes →

Verified against manufacturer documentation: bosch-home.com

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