E27
Baxi Protection Against Frequent Start/Stop (Anti-short-cycle)

Indoor unit shows E27; the unit may not start or may shut down with no obvious mechanical issue.

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Possible Causes

Thermostat set too close to room temperature causing rapid cycling, Power interruptions, Control PCB anti-short-cycle timer active, Faulty room sensor causing erratic readings

How to Fix / Troubleshooting

Steps:

  • 1. Wait for the timer to expire: Many Baxi units enforce a 3–5 minute delay between compressor starts. Wait and see if the unit starts automatically.
  • 2. Adjust the setpoint: Change the temperature setting by 2–3°C away from room temperature to reduce rapid cycling.
  • 3. Avoid frequent power cycling: Do not repeatedly turn the unit on and off at the breaker.

Note: If E27 appears constantly and the unit never starts, the control PCB or sensor may be faulty and require service.

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Repair Difficulty

Very Easy 1/5
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