Whirlpool Refrigerator Error Code 18 — High Temperature Alert
What this means
The error code 18 on Whirlpool refrigerators indicates the internal temperature has risen above the set point, most often caused by a power failure, a door left open for an extended period, or a cooling system malfunction. Unlike the PO code which specifically indicates a power outage, code 18 is a general high-temperature warning that can have multiple causes. The refrigerator should be checked to ensure it is cooling properly.
Step-by-step fix
4 stepsDismiss the alert and check the doors
Press any button on the control panel to dismiss the high temperature alert. Check that both the refrigerator and freezer doors are fully closed and sealed. Push them firmly to ensure the gaskets are making full contact.
Items on shelves or in door bins can sometimes prevent the door from closing completely — check for any obstructions.
Check for recent causes
Consider whether there has been a recent power outage, if the door was left open, or if a large amount of warm food was recently loaded. Any of these can temporarily raise the internal temperature.
Adding a large amount of warm food (like holiday leftovers) can raise the temperature enough to trigger this alert.
Verify the compressor is running
Listen at the back of the refrigerator for the low hum of the compressor. If you do not hear it, wait a few minutes as the compressor cycles on and off. If it never starts, there may be a compressor or relay issue.
Place your hand near the bottom rear of the fridge — you should feel warmth from the condenser if the compressor is running.
Monitor the temperature
Place a thermometer in the refrigerator and check it after 2 hours. The temperature should be trending downward toward the set point (typically 37°F for the fridge, 0°F for the freezer). If it is not cooling, further diagnosis is needed.
Check the condenser coils underneath or behind the refrigerator — dusty coils can reduce cooling efficiency significantly.
When to call a professional
If the temperature does not decrease within several hours, the compressor, condenser fan, or evaporator fan may be failing. A refrigeration technician should diagnose the cooling system.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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