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F6: Compressor Decreased Frequency Due to Overload


Safety Note: Before any component is electrically disconnected in the unit, shut off main power. Inverter board DC bus voltage can take up to 15 min to discharge.

Caution: Do not plug or unplug components while electrical power is present, this can damage the equipment and control boards.

Step 1: Check the Outdoor Ambient Hi/Low

  • Measure and record the outdoor ambient temperature. Ensure it is within the acceptable operating range for the system.

  • Verify that the outdoor ambient sensor is functioning correctly. Inspect the sensor for any damage and check its readings against the actual temperature.

  • If the outdoor ambient temperature is too high, it may contribute to compressor overload. Address any factors contributing to excessive ambient temperatures, such as poor ventilation or obstructions around the outdoor unit.


Step 2: Check for Dirty Filters, Coils

  • Inspect and clean both the indoor and outdoor coils. Dirty coils can reduce heat exchange efficiency, leading to increased workload on the compressor.

  • Check and replace air filters if they are dirty or clogged. Restricted airflow can contribute to compressor overload.


Step 3: Check for Blocked Air Flow

  • Examine the overall system for any obstructions or blockages that may impede proper airflow. Ensure that vents and registers are unobstructed.

  • Verify that there are no physical barriers around the outdoor unit that could restrict the intake or exhaust of air.


Step 4: Check if System Overcharged

  • Measure the refrigerant pressures and compare them to the manufacturer's specifications. High pressures may indicate overcharging.

  • If overcharging is suspected, recover the excess refrigerant following proper procedures. Consult system documentation for specific guidelines on refrigerant levels.


Step 5: Check the Indoor Fan Motor

  • Verify the operation of the indoor fan motor. Ensure it starts and runs smoothly.

  • Check for any obstructions or mechanical issues that may impede the rotation of the indoor fan.


Step 6: Check the Outdoor Fan Motor

  • Inspect the outdoor fan motor for proper operation. Ensure it starts and runs smoothly.

  • Check for any debris, obstructions, or mechanical issues that may affect the outdoor fan's performance.

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