Hotpoint Refrigerator Error Code dP — Defrost Problem / Defrost Heater Fault
What this means
The dP error code on Hotpoint refrigerators indicates a defrost system failure. The automatic defrost cycle is supposed to run periodically to melt frost from the evaporator coils. When the defrost heater, defrost thermostat, or defrost timer/control board fails, ice builds up on the coils and restricts airflow, causing the refrigerator to warm up. This code alerts you that the defrost cycle did not complete successfully.
Alternate codes: DP
Step-by-step fix
4 stepsCheck for frost buildup on the evaporator
Remove the back panel inside the freezer compartment to expose the evaporator coils. If the coils are covered in a thick layer of frost or ice, the defrost system has failed. Manually defrost by leaving the freezer door open with towels on the floor, or use a hair dryer on low heat to melt the ice.
Do not use a heat gun or sharp tools to remove ice — you can easily damage the evaporator coils or refrigerant lines.
Test the defrost heater
With the freezer panel removed and the coils accessible, locate the defrost heater (a glass or metal tube element mounted under or along the coils). Disconnect its wires and test for continuity with a multimeter. It should show continuity (typically 20 to 40 ohms). No continuity means the heater is burned out.
The heater may have multiple sections. Test across the full circuit — any break means the heater must be replaced.
Test the defrost thermostat
Locate the defrost thermostat (a small disc or cylinder clamped to the evaporator tubing). At room temperature, it should be open (no continuity). Cool it in a freezer for 15 minutes — it should close and show continuity. If it stays open at cold temperatures, it is faulty.
The defrost thermostat is a safety device that prevents the heater from overheating. If it fails open, the heater never turns on.
Replace the failed defrost component
Replace whichever component tested bad — the defrost heater, thermostat, or both. Reassemble the freezer panel and run the refrigerator for 24 hours to verify normal operation and no frost reaccumulation.
If both the heater and thermostat test good, the defrost control board or timer may be faulty. These are located behind the refrigerator.
When to call a professional
If all defrost components test good but frost keeps building up, the defrost control board or adaptive defrost timer needs diagnosis. A technician can verify the defrost cycle timing and board function.
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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