Viessmann High Temperature Protection of Compressor or Inverter

System stops; P2 error; often during high ambient temperatures

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.

Possible Causes

Blocked outdoor coil, Failed outdoor fan, Inadequate ventilation around outdoor unit, Inverter heat sink fan failure (if equipped)

Safety: Isolate power before cleaning or accessing the outdoor unit.

Clean coil: Remove dirt and debris from the outdoor heat exchanger.
Check fan operation: Confirm the outdoor fan runs at full speed. Replace if not.
Ensure clearance: Maintain recommended clearances around the unit for proper cooling.
Inspect inverter cooling: On models with a separate inverter fan, verify it operates correctly; replace if failed.

Hard 4/5

Outdoor Fan Motor

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