Baxi Short Cycling / Control or Sizing Issue

Unit frequently turns on and off (short cycling) without maintaining temperature

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Possible Causes

Oversized Baxi unit for room size, Thermostat sensor located in direct airflow, Dirty filters causing rapid temperature swings, Faulty room temperature sensor

How to Fix / Troubleshooting

Steps:

  • 1. Check sensor location: Ensure the indoor room sensor is not directly in the cold air stream; it should sense room air, not supply air.
  • 2. Clean filters and coil: Restore proper airflow to reduce rapid temperature changes at the sensor.
  • 3. Adjust setpoint and fan speed: Use a moderate setpoint and continuous fan mode to stabilize room temperature.

Note: If the unit is significantly oversized, short cycling may be unavoidable without system redesign.

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Repair Difficulty

Easy 2/5

Required Part

Indoor Room Temperature Sensor (NTC)
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