How do you fix a Daikin error code U4?

Alton Alexander
By Alton AlexanderUpdated on June 4th, 2022

The daikin error code u4 is a code that is associated with the heating function of the daikin air conditioner. This error code happens when the air conditioner is not able to reach the set temperature. The most common cause of this error code is a dirty air filter.

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1. Check for blockages in the condenser unit

  1. Check the filter for blockages.
  2. Check the fan for blockages.
  3. Check the condenser unit for blockages.

2. Check for leaks in the refrigerant system

  1. Remove the front panel of the refrigerator.
  2. Inspect the evaporator coil for signs of leakage.
  3. If the coil is leaking, replace it.
  4. Inspect the condenser coil for signs of leakage.
  5. If the coil is leaking, replace it.
  6. Inspect the hoses and connectors that connect the coil to the condenser for signs of leakage.
  7. If the hoses and connectors are leaking, replace them.
  8. Reconnect the refrigerant system and test it for leaks.

3. Clean the evaporator coils

The first step is to unplug the refrigerator and turn it off. Then, remove the front panel. The evaporator coils are located behind the front panel. To clean the coils, use a vacuum cleaner with the hose attachment and clean the coils with the suction. After cleaning the coils, replace the front panel and turn the refrigerator on.

Still not working? maybe try one of these options:

  1. Check the thermostat settings.
  2. Check for air leaks in the ductwork.
  3. Have a professional service technician inspect and repair the unit.