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E4: High Temperature Protection


Step 1: Check the Outdoor Fan Motor

  • Inspect the outdoor fan motor for any signs of malfunction or irregularities.

  • Verify the wiring and connections to the outdoor fan motor.

  • Ensure that the fan blades are free from obstructions and can rotate freely.

  • Test the functionality of the outdoor fan motor.


Step 2: Check for Dirty Filters, Coils

  • Examine filters and coils for dirt or debris that may obstruct airflow.

  • Clean or replace dirty filters.

  • Clean coils to ensure efficient heat exchange.


Step 3: Check the Temp Sensor

  • Inspect the temperature sensor for proper functioning.

  • Verify the wiring and connections to the temperature sensor.

  • Replace the sensor if necessary.


Step 4: Check for Restriction

  • Inspect the system for any restrictions in airflow.

  • Clear any obstructions or blockages that may be restricting airflow.


Step 5: Check the Expansion Valve

  • Inspect the expansion valve for proper operation.

  • Verify the wiring and connections to the expansion valve.

  • Replace the expansion valve if necessary.


Step 6: Check the Strainer

  • Inspect the strainer for any signs of clogging or blockage.

  • Clean or replace the strainer as needed.


Step 7: Check by 4 Point Temp Check

  • Perform a 4-point temperature check to assess the system's performance.

  • Check temperatures at various points to identify any irregularities.

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