If the remote doesn't work, it doesn't mean the remote is damaged. Please follow these steps to match the remote again:
1. Unplug the purifier first, then plug it in, and do not turn it on. Install the remote control battery. (make sure to unplug the purifier first)
2. Press and hold at the same time both the "lock" & the "light" buttons located on the top of the air purifier for more than 3 seconds. You may hear a chime-like sound while holding these buttons. Continue to press these buttons until the word "OFF" appears on the front of the air purifier.
3. Once the word "OFF" displays on the front of the air purifier, release the "light" and "lock" buttons, then press the power button on the remote.
Your remote is now re-programmed to work with your air purifier.

If the unit keeps beeping, and the LED display spins in a circle and will not show numbers or start, maybe it is not defective, it usually means the sensor is not pressed. It shows that one of the covers on both sides isn't in the right position. Please try to reinstall the filters and the covers.  Please see the picture in the attachment, It shows the position of the cover sensor, the cover must press and hold the sensor, then the machine works.
Please try this way to confirm whether it is good or defective. Take off the two filters, then put the covers back and make sure the covers are in the right position. Then, try to turn on the air purifier. If this works, it means that the unit is good, the issue is caused by the filters being stuck on the cover. Please try to install the filter again and ensure that the cover is in the correct position after installing the filter. when the door cover is closed, the sensor should be pressed down. Also, you can use a pair of pliers to adjust its position. If there are still issues, please email us.

There are several possible causes of this situation.
1. There are devices that produce mist near the air purifier, such as humidifiers. Mist can interfere with the reading of the sensor, causing abnormal display. We recommend not to use humidifier equipment near the purifier.
2. There is dust on the lens of the sensor, please try to blow off the dust attached to the lens with an air blower. If it doesn't work, you can try to recalibrate the sensor. The steps are as follows:
Place the air purifier in a clean enclosed room or clean outdoor area, turn it on and run for 2-3 days, the purifier will automatically calibrate the sensor.
If none of the above methods work, please contact our after-sales to replace the sensor. You can send email to support@cleanforceair.com

Please make sure you are using a 2.4G WIFI, Rainbow air purifier is not able to connect 5G WIFI.
Please click HERE to see the steps.
During the connection process, it is important to distinguish between EZ mode and AP mode, their difference lies in the frequency of indicator light flashing.

There are several possible causes of this matter.
1. There is no filter in the air purifier. The Rainbow air purifier has a filter detection sensor, and it will not turn on when there is no filter. Please install the filter.
2. The power cord is defective. You can try to plug in and out the cord serval times. With the filter installed, if the power cord is good, you should be able to hear a 'di-' sound. If not, the power cord may be damaged, please contact the after-sales to get a new cord.
3. If you can hear a 'di-' sound, but the air purifier cannot turned on, it means the control system is defective. Please contact the after-sales.
4. If the filter is in position, and the power cord is good, but the air purifier still cannot be turned on, and you cannot hear a 'di-' sound, It means that the internal power supply system or filter sensor is damaged. Please contact the after-sales.

There are several possible causes of this situation.
1. There are devices that produce mist near the air purifier, such as humidifiers. Mist can interfere with the reading of the sensor, causing abnormal display. We recommend not to use humidifier equipment near the purifier.
2. There is dust on the lens of the sensor, please try to blow off the dust attached to the lens with an air blower. If it doesn't work, you can try to recalibrate the sensor. The steps are as follows:
Place the air purifier in a clean enclosed room or clean outdoor area, turn it on and run for 2-3 days, the purifier will automatically calibrate the sensor.
If none of the above methods work, please contact our after-sales to replace the sensor. You can send email to support@cleanforceair.com

This matter is caused by the firmware version 2.5.2, we have already resolved the issue. If your firmware version is 2.5.2, please upgrade to 10.0.5, and then your air purifier will not disconnect from the network.