E2
Bosch
Ambient Temperature Sensor Failure
Display shows E2 and the interior temperature fluctuates widely
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed ambient NTC sensor near control panel, Loose or oxidized connector at display PCB, Damaged harness between ambient sensor and main control, Faulty display/control PCB
How to Fix / Troubleshooting
Safety: Turn off power at the outlet or breaker before removing the control panel or display housing.
Steps to address E2:
- Locate the ambient sensor: On many Bosch wine coolers, the ambient sensor is located near the top control panel or behind the front grille, sensing room temperature.
- Remove trim: Carefully remove the control panel trim or front grille using a non-marring tool to avoid scratching stainless steel or glass.
- Inspect sensor and wiring: Look for a small probe or plastic-encased sensor connected by two thin wires. Check for damage, corrosion, or loose connectors.
- Test resistance: With power disconnected, unplug the sensor and measure resistance at room temperature. Compare to Bosch NTC specifications. Replace if readings are open, shorted, or inconsistent.
- Reconnect firmly: Clean any light oxidation on connectors with electrical contact cleaner and reseat firmly on the display or main control board.
- Replace display/control PCB: If the sensor tests good but E2 persists, the display PCB or main control board may be faulty and should be replaced by a qualified technician.
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Repair Difficulty
Medium
3/5
Required Part
Ambient NTC Temperature Sensor
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