Refrigeration not cooling or frosting over

Confirm the condenser fan runs and the vents are unobstructed. Clean the condenser coil with a brush and vacuum to restore airflow. Poor airflow is the most common cause of warm product and compressor overheating.

Check the door gasket for gaps and verify the door closes squarely. A weak seal pulls humid air into the cabinet, causing frost buildup and long run times. Inspect the evaporator area for ice and make sure the evaporator fan is running.

Verify thermostat settings and sensor placement. If the compressor never starts, test the start relay, overload, and capacitor. If it starts but short-cycles, check the temperature sensor and defrost timer for faults.

• Confirm airflow at both the condenser and evaporator fans.
• Measure cabinet temperature at the sensor location.
• Inspect for ice buildup around the evaporator coil.

• Vacuum condenser coils every 60–90 days.
• Replace worn door gaskets and realign doors promptly.
• Keep vents clear of boxes or stored product.

• Compressor does not start after relay/capacitor test.
• Persistent icing after defrost cycle.
• Refrigerant leak indicators (oil residue, hissing, poor cooling).

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• Document changes with time, machine ID, and location name.
• Verify settings, pricing, and service modes after each fix.
• Capture before/after results to confirm resolution.

• Test with known-good inputs and controlled conditions.
• Validate telemetry, alerts, and payment logs where applicable.
• Confirm location expectations and update the site contact.

• Configuration drift after firmware or component swaps.
• Inconsistent power or network conditions at the location.
• Gaps in preventive maintenance routines.

• Monitor for 7 days and note any repeat errors.
• Schedule follow-up if the site is high-traffic.
• Escalate with full logs and photos if issues repeat.

• Inspect harness integrity, connectors, and power supply stability.
• Review error codes against the OEM manual before swapping parts.
• Compare with a known-good component to isolate the fault.

• Clean sensors monthly and replace wear parts on schedule.
• Log firmware versions and configuration baselines.