E2
Bosch Indoor Evaporator Coil Freeze Protection / Temperature Sensor Error

Indoor unit displays E2 and the unit stops cooling; indoor fan may continue to run.

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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

Faulty indoor evaporator temperature sensor (NTC), Poor airflow due to clogged Bosch plasma/standard air filter, Low refrigerant charge causing coil icing, Indoor fan motor running at low speed or not at all

How to Fix / Troubleshooting

Safety first: Turn off power at the breaker before opening the indoor unit.

Steps to resolve:

  • Clean filters: Open the front panel, remove the Bosch air filters, and wash them with lukewarm water. Allow them to dry completely before reinstalling. Dirty filters are the most common cause of coil freezing.
  • Check indoor fan operation: Turn the unit on (after re-energizing) and verify that the indoor cross-flow fan runs at all speed settings. If it is slow or intermittent, the fan motor or capacitor may be failing.
  • Inspect evaporator sensor: With power off, locate the evaporator NTC sensor clipped to the coil. Ensure it is firmly attached and not hanging loose. Check the sensor wiring for damage or disconnection.
  • Defrost the coil: Leave the unit off for several hours with the front panel open to allow any ice to melt. Place towels under the unit to catch drips.

If E2 returns quickly: Low refrigerant or a defective evaporator sensor is likely. Both require a qualified Bosch HVAC technician to test sensor resistance, check system pressures, and recharge or repair leaks.

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Repair Difficulty

Medium 3/5

Required Part

Indoor Evaporator Temperature Sensor (NTC)
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