Maxon Split Air Conditioner Error Codes


MXI 09HC001 – / MXO-09HC001 MXI 12HC001 – / MXO-12HC001

SELF DIAGNOSIS FUNCTION

Our company provides the end-users with thoughtful services by installing various diagnostic systems to indicate the following irregular performances.

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

Items to be checked first

1. Is the voltage of the power correct? The input voltage shall be rating voltage 10%. The air conditioner may not operate properly if the voltage is out of this range.

2. Is the link cable connecting the indoor unit and the outdoor unit linked properly? Please refer to the “wiring diagram” Check the terminals if the indoor unit and outdoor unit are properly linked by the same number of cables.

3. When a problem occurs due to the contents illustrated in the table below, it is symptom not related to the malfunction of the air conditioner.

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

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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.


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