Ako E10 Error Code

What does Ako E10 mean?

E10 indicates a defrost error on the first evaporator. The defrost cycle did not complete correctly — the evaporator did not reach the defrost end temperature (d4) within the maximum defrost time (d2), resulting in an Adt (defrost time-out) alarm for the first evaporator. This means ice may remain on the coil after the defrost cycle ended.

Symptoms

• E10 appears on the display after a defrost cycle.
• Adt (defrost time-out) indicator confirms defrost ended by maximum time, not by temperature.
• Residual ice may remain on the first evaporator coil.
• Alarm relay activates.
• Defrost cycles may become progressively less effective if ice builds up over multiple cycles.

Common causes

• Faulty or failed defrost heater(s) on the first evaporator (most common for electric defrost).
• Defrost end-temperature probe (S2) incorrectly positioned away from the evaporator coil.
• Maximum defrost time (d2) set too short for the ice load on the evaporator.
• Defrost end temperature (d4) set too high relative to the heater capacity.
• Excessive ice build-up from refrigerant overfeeding or very high humidity infiltration.

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Diagnostic steps

1. Inspect the first evaporator after defrost for residual ice

   Immediately after E10 appears, open the evaporator access panel and check for remaining ice. This confirms whether the defrost produced any heating or failed completely.

2. Check defrost heater continuity (electric defrost)

   Isolate power and measure continuity of each defrost heater element on the first evaporator. An open-circuit heater element is the most common cause of E10.

3. Verify defrost end probe S2 position

   Confirm S2 is clipped firmly to the first evaporator coil at the designated defrost termination point, not suspended in free air where it reads warm ambient air before the ice clears.

4. Review d2 and d4 parameter values

   Confirm d2 (maximum defrost time) is long enough for the installed heater capacity and ice load. Verify d4 (defrost end temperature) is achievable with the fitted heaters.

5. Manually trigger a defrost and monitor completion

   Initiate a manual defrost and monitor whether it completes by temperature (S2 reaching d4) or by time-out. This confirms whether the heaters are producing heat and guides further diagnosis.

When to call a professional

Call a licensed refrigeration technician to replace defrost heater elements, as this involves electrical work inside the refrigerated enclosure at mains voltage. A technician is also needed if the ice build-up is caused by refrigerant overfeeding requiring expansion valve adjustment or if the evaporator has developed a refrigerant leak.