1. Please set the fan speed into low mode to check whether the noise is air flow noise.
2. At beginning of the unit running, there will be a expand and contract noise, it will disappear after running for a while.
3. If above method couldn't solve your problem, please call for our aftersale service
Universal Access Number:
(042) 1111 42437 (Haier)
Service Time:9:30am-6:30pm (From Monday to Sunday)