Defrost Controls

Defrost controls manage the heat pump defrost cycle to remove frost and ice from the outdoor coil during cold-weather operation. When defrost logic is working correctly, the system maintains airflow, efficiency, and stable heating performance without excessive runtime or nuisance shutdowns.

If you’re diagnosing frequent defrost, no defrost (ice buildup), extended defrost cycles, or intermittent heating, the defrost board/control and its related sensors are key parts to verify. Shop by OEM compatibility, voltage, and connection style to match your system.

• Defrost control boards for heat pumps and packaged systems
• Time/temperature logic support for proper coil defrost operation
• OEM-compatible replacements for correct fit and safe sequencing
• Common fix for icing, frequent defrost, or defrost lockout symptoms
• Pairs with sensors like coil temperature and ambient sensors (when applicable)

Confirm the equipment model and original part number before ordering. Defrost controls can be system-specific and may require matching sensor inputs and wiring. After replacement, verify correct defrost initiation/termination and confirm normal heating operation.

Pro tip: Add the most common companion parts to carts — coil sensors, ambient sensors, contactors, and capacitors often pair with defrost repairs and increase average order value.