Bosch · Refrigerator
Bosch Refrigerator E12 Error Code
Condenser fan motor not running
What this error means
E12 means the condenser fan at the compressor base is not running or not reporting speed—the motor that rejects heat from the sealed system failed. Bosch may clear E12 briefly after reset but it often returns within three hours until repaired.
How E12 is detected
When E12 appears on a Bosch refrigerator, the control board has confirmed that water did not leave the machine within the programmed drain window. On Bosch B36CD50SNS, Bosch B36CL80ENS, and similar variants, the drain pump runs for a fixed interval—often three to seven minutes on washers and dishwashers—while a pressure switch or turbidity sensor verifies the tub or sump is empty. If water remains, the cycle stops to prevent spin with a full tub or overflow on the next fill.
Most E12 calls are resolved without parts: unplug and vacuum coils and the fan grille at the bottom rear. Restricted drain paths mimic pump failure because the impeller spins against a blocked hose or filter. Document whether the pump hums audibly during the drain step; a humming pump with no water movement points to a clogged filter or kinked hose, while silence may indicate a failed pump motor or loose wiring at the harness.
After clearing blockages, run a short cycle and listen at the drain hose for steady water flow. If E12 returns on the next load with a clean filter and straight hose, measure resistance at the pump motor connector per the service manual for your model before ordering a replacement pump assembly.
Common causes
- Condenser fan bearing seized from dust
- Wire harness unplugged during moving the unit
- Object blocking the fan blade under the machine
- Main board fan driver failure
Step-by-step fixes
- 1Unplug and vacuum coils and the fan grille at the bottom rear
- 2Spin the fan blade by hand—it should rotate without grinding
- 3Restore power and confirm fan starts within two minutes
- 4Keep toe-kick vents clear on built-in installs
When to call a technician
E12 on schedule after cleaning requires condenser fan motor replacement.
Affected models
- Bosch B36CD50SNS
- Bosch B36CL80ENS
- Bosch B36CT80SNB
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use refrigerators to prevent E12 from lint and food debris buildup.
- Record when E12 appears in the cycle and whether it clears after a 60-second power reset on your Bosch refrigerator—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for E12; Bosch uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting E12; reversed plugs on pumps and valves cause immediate repeat faults.