Asko Freezer E4 Error: Compressor overheating
Asko freezer E4 error is a common issue reported by Asko appliance owners. What Asko Freezer Error Code E4 Means Error code E4 on an Asko upright freezer indicates that the compressor or condenser has reached an unsafe operating temperature and the thermal protection circuit has activated. The control board limits or stops compressor run […]
No
DIY Fixable
From $170
Typical Repair Cost
60-90 min
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. Continued operation with E4 active risks permanent compressor damage. Transfer all frozen food to a backup freezer until the cause is identified and corrected.
Can I reset the code?
No. E4 requires the root overheating cause to be resolved — cleaning the condenser or fixing the fan. A reset will not prevent the thermal overload from tripping again.
When to stop immediately?
Stop if you notice: The compressor compartment is too hot to keep a hand on for more than one second., The freezer temperature is above -12 °C (10 °F) and not recovering after condenser cleaning and restart..
Symptoms You May Notice
Back and base of the freezer are very hot to touch
The compressor compartment and condenser area at the rear or base of the unit are significantly hotter than the slight warmth that is normal during operation, indicating that heat is not being dissipated properly.
Freezer temperature gradually rises over several hours
As the compressor thermal overload trips repeatedly or the board limits run time, the cabinet temperature slowly climbs above the set point despite the compressor appearing to run briefly before cutting out.
Short compressor on/off cycling pattern
Instead of normal longer run periods, the compressor starts, runs for only 2–5 minutes, and then cuts out as the thermal protector trips again — a cycle that repeats every 15–30 minutes.
E4 displayed on the control panel
The control board shows E4 to indicate that an overtemperature condition has been detected at the compressor or condenser and protective shutdown has occurred.
Possible Causes
Blocked condenser coils or ventilation
Dust and lint build-up on the condenser coils, or the freezer being pushed too close to a wall or cabinet restricting airflow, is the most common cause of compressor overheating.
DIY PossibleFailed condenser fan (on models with active condenser cooling)
If the model has a condenser fan that has seized or stopped, heat cannot be removed from the condenser rapidly enough, causing temperature to rise to the fault threshold.
DIY PossibleLow refrigerant charge causing compressor overwork
A slow refrigerant leak forces the compressor to run longer and work harder to achieve the same cooling effect, generating more heat and eventually triggering the overtemperature fault.
Requires ProfessionalSafe Checks You Can Do
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1
Clean condenser coils and improve ventilation
Unplug the freezer and pull it away from the wall. Use a vacuum cleaner with a brush attachment to remove all dust and lint from the condenser coils at the rear. Ensure there is at least 50 mm of clearance on all sides and at least 200 mm above the unit for heat to escape.
Annual condenser cleaning is recommended by Asko to prevent E4 recurring, particularly in dusty environments or homes with pets.
Tools required -
2
Allow the compressor to cool, then restart
After cleaning, leave the freezer unplugged for 30 minutes to allow the compressor to cool fully before restarting. This resets the thermal overload protector inside the compressor.
Do not restart immediately after unplugging — the thermal overload needs time to reset or it will trip again instantly.
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3
Check the installation location temperature
Verify the room temperature where the freezer is installed. Asko upright freezers are typically rated for ambient temperatures of 10–38 °C (SN–T climate class). Operating in a hotter environment (e.g., an uninsulated garage in summer) can cause persistent E4.
If the installation space is hotter than 38 °C, consider relocating the freezer or improving room ventilation.
When to Call a Professional
Contact a qualified technician if:
- After a thorough condenser clean and improved ventilation, E4 returns within a day — a refrigerant leak or failing compressor is likely (diagnostic from $100, repair from $250).
- The condenser fan is confirmed stopped and not resolved by the wiring checks in the E3 procedure — it needs replacement.
- The compressor is humming but not starting — the start relay or capacitor has failed (part from $15, labour from $80).
Need Professional Help?
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