All Bosch Refrigerator Error Codes — Complete Troubleshooting Guide (2026)
This is the Bosch refrigerator code list we publish — 6 guides. Sealed-system work is a stop-line. Fan, defrost, and sensor codes are the DIY set.
Detailed Error Code Guides
Error d01: The d01 code tells the refrigerator’s electronic control board that a door is open when it should be closed. The alarm sounds, the display may flash, and the unit may enter a protective mode to save energy. Ignoring it can waste electricity and cause temperature swings.
Fix Bosch Refrigerator error d01 (door ajar alarm) fast. Learn symptoms, root causes, a 60‑second reset, step‑by‑step repair, parts cost, and warranty info.
- Quick Reset – Power Cycle the Refrigerator
- Verify the Door is Fully Closed
- Inspect the Door Gasket for Damage or Debris
- ...see all 6 steps →
Tools needed: Phillips #2 screwdriver, Flat‑head screwdriver (3 mm), Digital multimeter, Socket set (5 mm and 8 mm)
Read full troubleshooting guide →Error d02: The d02 code signals a high temperature alarm in the fridge compartment. The control board has detected that the internal temperature is above the safe range, usually because cooling isn’t happening correctly. If left unchecked, food can spoil and the fridge may shut down to protect its compressor.
Fix Bosch Refrigerator error d02 fast. Learn why the high‑temp alarm sounds, see quick reset steps, root causes, parts, cost estimates, and preventive tips....
- Quick Power‑Cycle Reset
- Verify Door Seals and Close‑Up
- Check the Evaporator Fan
- ...see all 7 steps →
Tools needed: Phillips #2 screwdriver, Flat‑head screwdriver, Digital multimeter (with temperature probe option), 8 mm socket wrench
Read full troubleshooting guide →Error E02: The E02 code tells the Bosch fridge’s electronic control board that the evaporator fan motor isn’t turning or is drawing too much current. Without a working fan, cold air can’t circulate, so the freezer and fresh‑food compartments warm up quickly.
Fix Bosch Refrigerator error E02 (evaporator fan motor failure) fast. Learn symptoms, root causes, step‑by‑step repair, parts cost, and when to call a pro.
- Quick Check – Power Cycle the Refrigerator
- Listen for the Evaporator Fan
- Safety First – Disconnect Power
- ...see all 8 steps →
Tools needed: Phillips #2 screwdriver, Flat‑head screwdriver (size 5 mm), T20 Torx bit, Multimeter (for continuity test), Nut driver set
Read full troubleshooting guide →Error E03: Error E03 tells the control board that the freezer temperature sensor is missing, shorted, or sending a signal outside the normal range. The fridge may stop cooling or keep the error on the display, preventing the freezer from reaching its set temperature.
Fix Bosch Refrigerator error E03 (freezer sensor error) fast. Learn symptoms, root causes, step‑by‑step reset, tools, parts, cost estimate, and when to call...
- Power‑Cycle the Refrigerator
- Inspect the Sensor Wiring Harness
- Test the Sensor with a Multimeter
- ...see all 5 steps →
Tools needed: Phillips #2 screwdriver, T20 Torx screwdriver, Digital multimeter (set to continuity or ohms), 8 mm socket set
Read full troubleshooting guide →Error E04: Error E04 means the fridge’s temperature sensor (thermistor) isn’t sending a valid signal to the control board. The board may stop cooling or run the compressor nonstop.
Learn why Bosch Refrigerator error E04 shows up, how to reset, test the sensor, DIY part costs, warranty info, and support phone.
- Quick Power Reset
- Verify Cooling Symptoms
- Locate the Temperature Sensor
- ...see all 9 steps →
Tools needed: Phillips #2 screwdriver, Torx T20 screwdriver, Digital multimeter (set to ohms and voltage), Flat‑head screwdriver (small size for trim clips), Insulated‑handle pliers
Read full troubleshooting guide →Error E05: The E05 code tells the refrigerator’s electronic control board that the defrost heater circuit isn’t working properly. When the heater can’t melt ice on the evaporator coil, frost builds up and the fridge runs warmer than it should.
Fix Bosch Refrigerator error E05 (defrost heater circuit) fast. Learn symptoms, root causes, DIY steps, parts, cost and warranty info in this 2026 guide.
- Quick Power Cycle
- Remove the Freezer Rear Panel
- Inspect Heater Wiring
- ...see all 9 steps →
Tools needed: Phillips #2 screwdriver, T20 Torx screwdriver, Multimeter (continuity and resistance settings), Needle‑nose pliers
Read full troubleshooting guide →Common Bosch Refrigerator Problems
Beyond specific error codes, Bosch Refrigerator owners frequently encounter these issues:
- Error codes that keep coming back — Usually indicates the root cause wasn't fully addressed. Follow our complete repair guides above.
- Multiple error codes at once — Often points to a control board issue or power supply problem. Check our individual guides for related codes.
- Error code not listed here — Contact Bosch support directly or check your owner's manual. We update this guide as new codes are discovered.
What techs actually see on Bosch Refrigerators
- Dirty connectors and harness chafe more often than “bad boards.”
- Power-cycle theater that never found the actual open sensor.
- Wrong part family because the door sticker was not photographed.
When to Call a Professional
While many Bosch Refrigerator error codes can be resolved with basic troubleshooting, call a certified technician if:
- The error persists after following all troubleshooting steps
- You see signs of electrical damage, burning smells, or water leaks
- The repair requires specialized tools or involves gas/electrical connections
- Your appliance is still under warranty — DIY repairs may void coverage