Ignis Defrost Heater Circuit Error

Display shows E4; defrost heater does not energize and ice accumulates on the evaporator.

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

Open defrost heater, Failed defrost thermostat, Broken wiring in heater circuit, Defective defrost relay on control board

Safety first: Unplug the freezer. Water and electricity are a dangerous combination.

Manual defrost: Allow all ice to melt so you can access components safely.
Test heater: Disconnect heater leads and measure resistance. Replace the defrost heater if open.
Check thermostat: Test the defrost thermostat for continuity when cold. Replace if open.

If heater and thermostat are good, the defrost relay or control board is likely faulty and should be replaced by a technician.

Hard 4/5

Defrost Heater

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