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Remove batteries and keep for 5 minutes. And also remove DC wire plugged in display sensor in your indoor unit. Now, plug again DC wire in same position and also put batteries in remote. Power on and try now. In many units, this type of resetting would help. If still problem, check remote thr' camera mobile by pressing any button in remote. If ultra light flashes, remote is o.k.You have to repair/replace PCB only. If no ultra light, replace remote.Thanks.
If your remote control have display but cannot transmit signal to the unit. Confirm first if the remote is really the problem, using your camera or cellphone camera as your eyes point the remote transmitter to your camera and "on" the remote. You should see light emits in your remote control, if no emitted light then the remote control is defective. But if there is a light the defect is in the unit receiver.
Check also if there is a reset or rst button in your remote control and reset it and try.
Check also if there are error codes in the unit, reset the unit by disconnecting the power supply in the unit for 10 sec. and "on" again and try.
The unit can be operate without remote control, use the manual button located in the unit.
If the remote control have no display replacement of remote is recommended.
Try to check the remote control by using camera or cell camera, just use it as your eyes to see if the remote control emits signal. Just point your remote control to the camera and "on" then check if the remote control emits light, if no emitted lights means defective remote but if emit lights then the receiver is defective . Try also to locate if there are any reset or rst button on the remote control and press it then test.
First you have confirm what really the defects is, is it the remote control or the control board.
HOW TO CHECK THE DEFECTIVE REMOTE CONTROL: Check if the remote control if still good, using the camera of your
cellphone point remote control to the cellphone camera and press the
"on" button of your remote and you can see the light emitting from your
remote control transmitter. If the lights emits that means your remote
control is good, if not means the remote control is defective. If the remote emits light it means that the receiver at the control board
in the indoor unit is defective.
heres a clever way i use to check remotes are working. put your mobile phone into camera mode and point your remote control toward the camera while pressing any button.if working you will see a blue light emiting from your remote on phone screen.
Try to look for reset button in the remote control it can be found either in front or at the back inside the battery compartment. Just press this button with sharp object. This should be done every time you replace it with battery or if the remote control malfunction. But it wont work either the remote or the receiver itself has a defect. Try also to look for the freq. configuration of your remote if its available, you can see it at back of the remote inside the battery compartment the switch selector for "A" and "B". Try to set this and check also the board itself its set to the same config. ("A" or "B') and press reset button and test the remote control.
- check if the battery is still good - check if the receiver of the unit is clean and no obstruction. - Some of remote control have a reset switch, every time you change it with battery you have to reset it. - Some of remote control have A and B selector at board and remote control, check this if they set at the same frequency. - To check if the remote control still working you have to test your remote control to other unit with same model as yours. If its not working then replace your remote control. But if its working then you have to replace your receiver board. - Some remote control have to be reconfigure so you have to read your manual.
- Check if the battery is ok. - Some remote control have reset button, you can find it at the front or back at the compartment of the battery push the rst button with pin or ballpen to reset it and try. - Some remote control have selector switch in both remote control and at the board inside the unit. Try to transfer the switch button from A to B and also at the board inside the unit and reset the remote control and try.Or need to reconfigure the remote control to select the frequency. - Try your remote control to other unit with same brand as yours to confirm if your remote control is really need a replacement. If it works then your receiver board in the unit is need a replacement. Or if wont work then you have to buy a new remote control. But if you have no budget then try to switch on the unit using emergency button to operate the unit.