Daikin unit stops with E4; this often occurs during heating mode.

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

Refrigerant leak, Blocked indoor coil or filter, Expansion valve malfunction, Frost/ice buildup on the outdoor coil

Safety first: Do not attempt to add refrigerant yourself. Turn off power before cleaning filters or coils.

User steps:

Clean indoor filters and ensure indoor airflow is not restricted.
Check the outdoor unit for heavy ice buildup; allow the unit to defrost by turning it off if necessary.

Technician tasks:

Leak-check the system and repair any leaks.
Verify the operation of the electronic expansion valve (EEV) and replace it if stuck.
Recharge refrigerant to the correct Daikin-specified amount.

Professional Required 5/5

Refrigerant Circuit / Electronic Expansion Valve

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