Daikin Short Cycling / Control or Sizing Issue

Daikin air conditioner frequently turns on and off (short cycling) without reaching set temperature

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.

Possible Causes

Oversized unit for room size, Thermistor sensing incorrect air (e.g., near heat source), Dirty filters causing erratic airflow, Faulty room temperature sensor

How to Fix / Troubleshooting

Safety first: Turn off power before moving sensors or opening covers.

User steps:

Ensure the remote controller (if it has a built-in sensor) is not placed near heat sources or in direct sunlight.
Clean air filters to stabilize airflow.
Avoid setting the temperature extremely low; use moderate setpoints.

Technician tasks:

Check room thermistor placement and relocate if it is in a draft or near heat.
Test thermistor accuracy and replace if faulty.
Evaluate system sizing relative to room load.

Repair Difficulty

Medium 3/5

Required Part

Room Temperature Thermistor

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