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Manual for 40MHH - Troubleshooting and error codes + PDF Download
Uploaded: March 30, 2025, 4:26 p.m.
Manual Publish Date: 2017-10
Warranty Summary
No warranty information is provided in this owner's manual.
The 40MHH High Wall Ductless System provides quiet, maximum comfort with cooling, heating, filtering, and dehumidifying capabilities. It operates in five modes: Fan Only, Auto, Heating, Cooling, and Dehumidification (DRY). The system is controlled via a wireless remote, or manually via the 'Auto' setting on the unit. Key functions include adjusting temperature, fan speed, airflow direction, and setting timers. For optimal use, keep filters clean and avoid obstructing air intakes. Use energy-saving features like SLEEP mode and TIMER function.
Troubleshooting and error codes
| Issue | Possible Causes |
|---|---|
| Unit does not turn on when pressing ON/OFF button | The unit has a 3-minute protection feature that prevents the unit from overloading. The unit cannot restart within three minutes of being turned off. |
| The unit changes from COOL/HEAT mode to FAN mode | The unit may change its setting to prevent frost from forming on the unit. Once the temperature increases, the unit starts operating in the previously selected mode again. The set temperature has been reached, at which point the unit turns off the compressor. The unit continue operating when the temperature fluctuates again. |
| The indoor unit emits white mist | In humid regions, a large temperature difference between the room's air and the conditioned air can cause white mist. |
| Both the indoor and outdoor units emit white mist | When the unit restarts in HEAT mode after defrosting, white mist may be emitted due to moisture generated from the defrosting process. |
| The indoor unit makes noises | A rushing air sound may occur when the louver resets its position. A squeaking sound may occur after running the unit in HEAT mode due to expansion and contraction of the unit's plastic parts. |
| Both the indoor unit and outdoor unit make noises | Low hissing sound during operation: This is normal and is caused by refrigerant gas flowing through both indoor and outdoor units. Low hissing sound when the system starts, has just stopped running, or is defrosting: This noise is normal and is caused by the refrigerant gas stopping or changing direction. Squeaking sound: Normal expansion and contraction of plastic and metal parts caused by temperature changes during operation can cause squeaking noises. |
| The outdoor unit makes noises | The unit makes different sounds based on its current operating mode. |
| Dust is emitted from either the indoor or outdoor unit | The unit may accumulate dust during extended periods of non-use, which will be emitted when the unit is turned on. This can be mitigated by covering the unit during long periods of inactivity. |
| The unit emits a bad odor | The unit may absorb odors from the environment (such as furniture, cooking, cigarettes, etc.) which will be emitted during operations. The unit's filters have become moldy and should be cleaned. |
| The outdoor unit's fan does not operate | During operation, the fan speed is controlled to optimize product operation. |
| Operation is erratic, unpredictable, or unit is unresponsive | Interference from cell phone towers and remote boosters may cause the unit to malfunction. In this case, try the following: • Disconnect the power, then reconnect. • Press ON/OFF button on remote control to restart operation. |
Troubleshooting and error codes
| Issue | Possible Causes |
|---|---|
| Unit does not turn on when pressing ON/OFF button | The unit has a 3-minute protection feature that prevents the unit from overloading. The unit cannot restart within three minutes of being turned off. |
| The unit changes from COOL/HEAT mode to FAN mode | The unit may change its setting to prevent frost from forming on the unit. Once the temperature increases, the unit starts operating in the previously selected mode again. The set temperature has been reached, at which point the unit turns off the compressor. The unit continue operating when the temperature fluctuates again. |
| The indoor unit emits white mist | In humid regions, a large temperature difference between the room's air and the conditioned air can cause white mist. |
| Both the indoor and outdoor units emit white mist | When the unit restarts in HEAT mode after defrosting, white mist may be emitted due to moisture generated from the defrosting process. |
| The indoor unit makes noises | A rushing air sound may occur when the louver resets its position. A squeaking sound may occur after running the unit in HEAT mode due to expansion and contraction of the unit's plastic parts. |
| Both the indoor unit and outdoor unit make noises | Low hissing sound during operation: This is normal and is caused by refrigerant gas flowing through both indoor and outdoor units. Low hissing sound when the system starts, has just stopped running, or is defrosting: This noise is normal and is caused by the refrigerant gas stopping or changing direction. Squeaking sound: Normal expansion and contraction of plastic and metal parts caused by temperature changes during operation can cause squeaking noises. |
| The outdoor unit makes noises | The unit makes different sounds based on its current operating mode. |
| Dust is emitted from either the indoor or outdoor unit | The unit may accumulate dust during extended periods of non-use, which will be emitted when the unit is turned on. This can be mitigated by covering the unit during long periods of inactivity. |
| The unit emits a bad odor | The unit may absorb odors from the environment (such as furniture, cooking, cigarettes, etc.) which will be emitted during operations. The unit's filters have become moldy and should be cleaned. |
| The outdoor unit's fan does not operate | During operation, the fan speed is controlled to optimize product operation. |
| Operation is erratic, unpredictable, or unit is unresponsive | Interference from cell phone towers and remote boosters may cause the unit to malfunction. In this case, try the following: • Disconnect the power, then reconnect. • Press ON/OFF button on remote control to restart operation. |