E17
Baxi High Pressure Protection

Indoor unit shows E17; unit may stop with no cooling or heating

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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

Blocked or very dirty outdoor condenser coil, Overcharged refrigerant, Non-condensable gases in system, Failed outdoor fan motor reducing airflow

How to Fix / Troubleshooting

Safety: High-pressure faults involve the refrigerant circuit. Only certified technicians may connect gauges or adjust charge.

Steps (homeowner):

  • 1. Clean outdoor coil: With power off, clean the condenser coil using a soft brush and low-pressure water. Ensure good airflow around the unit.
  • 2. Check fan operation: Confirm the outdoor fan runs whenever the compressor is running.
  • 3. Remove obstructions: Ensure no covers, plants, or walls are blocking discharge air.

Technician tasks: Check refrigerant charge, high-pressure switch operation, and system design. Correct overcharge or system contamination as needed.

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Repair Difficulty

Professional Required 5/5

Required Part

High Pressure Switch
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