E2
Viessmann
Low-Pressure Protection / Evaporator Freeze
Unit stops cooling; E2 error; may be accompanied by frost on indoor coil
Advertisements
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.
Advertisements
Possible Causes
Low refrigerant charge due to leak, Severely clogged air filters, Indoor fan not running or running too slowly, Blocked expansion device
How to Fix / Troubleshooting
Safety: Turn off power before cleaning or inspection. Refrigerant diagnosis must be done by a licensed technician.
- Clean filters and coil: Wash filters and clean the indoor coil. Ensure all supply and return grilles are open.
- Check indoor fan: Confirm the fan runs at all speeds and airflow is strong. Replace the fan motor if it fails to start.
- Defrost coil: If the coil is iced, leave the system off until all ice melts. Do not chip ice with sharp tools.
- Leak and charge check (technician): If E2 recurs, a technician should check for refrigerant leaks, repair them, and recharge the system to Viessmann specifications.
Advertisements
Repair Difficulty
Professional Required
5/5
Required Part
Refrigerant Circuit (Leak Repair and Recharge)
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements