EE TROUBLESHOOTING STEPS:

​

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 Temp Sensor

• Examine the temperature sensor (Temp Sensor) for any signs of damage or irregularities. Ensure that the sensor is securely connected and that its wiring is intact.

• Verify that the temperature sensor is providing accurate readings within the expected range. Refer to the system's specifications for the correct temperature values.

• If the temperature sensor is faulty or reading incorrect values, consider replacing it with a new sensor that meets the manufacturer's specifications.

 

Step 2: Check the Outdoor Board

• Inspect the outdoor control board for any visible signs of damage, such as burnt components, damaged traces, or loose connections.

• Check the EPROM (Erasable Programmable Read-Only Memory) chip on the outdoor board for proper loading and functioning. Look for any issues that may affect the loading process.

• If there are issues with the EPROM chip loading, consult the system's technical documentation or contact the manufacturer for guidance on reloading or replacing the EPROM chip.