Maxon Air Conditioner Error Codes

Check Code	Diagnosis of malfunction
FAULT F6	PG motor faults
FAULT F7	Indoor TEMP sensor faults
FAULT F8	Indoor coil pipe TEMP sensor faults
FAULT F9	Outdoor coil pipe TEMP sensor faults

Troubleshooting

Operation of air conditioner: In COOL operation mode, the compressor does not operate at a room temperature higher than the setting temperature that the indoor fan should operate. In a HEAT operation mode, the compressor does not operate at a room temperature lower than the setting temperature that indoor fan should operate.
Explanation: It happens after a delay of 3 minutes when the compressor is reoperated. The same phenomenon occurs when a power is on. As a phenomenon that the compressor is reoperated after a delay of 3 minutes, the indoor fan is adjusted automatically with reference to a temperature of the air blow.

Operation of air conditioner: Fan speed setting is not allowed in AUTO or DRY mode
Explanation: The speed of the indoor fan is set to low in DRY mode. Fan speed of 3 steps is selected automatically in AUTO mode.

Operation of air conditioner: Compressor stops operation intermittently in DRY mode
Explanation: Compressor operation is automatically controlled in DRY mode depending on the room temperature and humidity.

Operation of air conditioner: Compressor of the outdoor unit is operating although it is turned off in HEAT mode.
Explanation: When the unit is turned off while de-ice is activated, the compressor continues operation for up to 10 minutes(maximum) until the deice is completed.

Operation of air conditioner: Timer indicator lamp lights up and the air conditioner does not operate
Explanation: Timer is being activated and the unit is in ready mode. The unit operates normally if the timer operation is cancelled.

Operation of air conditioner: The compressor and indoor fan stop intermittently in HEAT mode.
Explanation: The compressor and indoor fan stop intermittently if room temperature exceeds a setting temperature in order to protect the compressor from overheated air in HEAT mode.

Operation of air conditioner: Indoor fan and outdoor fan stop intermittently in HEAT mode.
Explanation: The compressor operates in a reverse cycle to remove exterior ice in HEAT mode, and indoor fan and outdoor fan do not operate intermittently for within 20% of the total heat operation

Operation of air conditioner: The compressor stops intermittently in COOL mode or DRY mode, and fan speed of the indoor unit decreases.
Explanation: The compressor stops intermittently or the fan speed of the indoor unit decreases to prevent inside/outside air frozen depending on the inside/outside air temperature.