General Assist Technical Reference
Wall-Mounted Indoor Unit Crossflow Fan Contact Noise
KM and KG series inspection and corrective adjustment
Applies where a rubbing or scraping noise is caused by lateral movement of the crossflow fan during transport.
Certain KM and KG series wall-mounted indoor units may produce a rubbing or contact noise if the crossflow fan shifts sideways during transport. The fan may then contact the base assembly, generally at the left-hand end of the indoor unit.
Electrical safety: Turn the air conditioner off and isolate the power supply before accessing or adjusting the fan. This work should only be completed by appropriately qualified service personnel.
1. Identifying the issue
| Typical symptom | Rubbing, scraping or intermittent contact noise from the left side of the indoor unit while the fan is operating. |
| Likely cause | The crossflow fan has shifted laterally during transport and is contacting the base assembly. |
| Affected area | Left-hand fan housing near the base assembly. |
Crossflow fan contact location and service access overview.
2. Corrective action procedure
| 1 | Isolate the unit. Turn the air conditioner off and disconnect the power supply. |
| 2 | Access the fan. Open the louver and insert a cross-head screwdriver through the opening in the fan guard. |
| 3 | Locate the service opening. Carefully rotate the crossflow fan with the screwdriver until the access area with no fan blade is aligned with the opening. |
| 4 | Locate the fixing screw. Identify the cross-head fan fixing screw through the service access opening. |
| 5 | Loosen the screw. Turn the fixing screw approximately one turn counter-clockwise. Do not remove it. |
| 6 | Reposition the fan. Move the crossflow fan approximately 2 mm to the right, or to the position where adequate clearance is achieved and no contact occurs. |
| 7 | Secure the fan. Re-tighten the fixing screw and manually confirm that the fan rotates freely without contacting surrounding components. |
| 8 | Test the unit. Restore power and perform a test run to confirm the noise has been eliminated. |
Important: Take care not to damage or deform the fan blades while rotating or repositioning the crossflow fan.
Fan fixing screw location and approximate 2 mm right-hand adjustment.
3. Affected models
| Market | Applicable indoor-unit models |
|---|---|
| Europe | ASYG07-24KGTA, KGTB, KMTA and KMTB |
| Australia | ASTG09-24KMTC |
| India | ASGG12-18CGTA-B |
| Singapore | ASA09/12JGTA |
| Thailand | ASM09/12/18CGTA |
| Taiwan | ASC022-083CMTB and KGTA |
4. Final operational check
After the adjustment, confirm all of the following before completing the service work:
- The crossflow fan rotates freely by hand.
- No rubbing, scraping, hitting or vibration noise is present during operation.
- The fixing screw is secure.
- The louver and fan guard are correctly positioned.
- The unit operates normally at all fan speeds.
Service outcome: Repositioning the crossflow fan approximately 2 mm to the right restores clearance between the fan and base assembly and resolves contact noise caused by transport-related misalignment.