E18
Baxi Low Pressure / Refrigerant Undercharge Protection

Indoor unit shows E18; unit may stop with poor cooling and frost on indoor coil

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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

Refrigerant leak in indoor or outdoor coil, Blocked expansion device, Dirty indoor filter causing coil freeze, Faulty low-pressure sensor

How to Fix / Troubleshooting

Safety: Refrigerant is under pressure and must not be released by unlicensed persons.

Steps:

  • 1. Check filters: Clean or replace indoor air filters to ensure proper airflow.
  • 2. Inspect indoor coil: Look for ice build-up. If present, turn off the unit and allow it to thaw completely before reuse.
  • 3. Visual leak check: Look for oil stains on pipe joints or coils, which may indicate a refrigerant leak.

Action: A certified technician must locate and repair leaks, evacuate, and recharge the system to Baxi specifications. The low-pressure sensor may also need replacement.

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Repair Difficulty

Professional Required 5/5

Required Part

Low Pressure Sensor
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