When pressing any button on the the remote the display on the recorder reads "1 Chk remote". It was working fine until last week. I have changed the batteries twice and unplugged the unit to try and reset it, to no avail. I believe the IR (infra-red) is working as it still turns on the television, but it seems to have lost the correct transmission for the unit to functtion.
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Panasonic remotes have two channels. Press OK and simultaneously 1 and hold for more than five seconds. Then try to power up using the remote. If that doesnt work press OK and 2 and hold. One of those will control the machine. Make sure you have good batteries in the right way.
Actually, you are sort of correct, in a sense, RC1 means remote command mode 1 (the default mode of your combo unit). There is one way you can try to fix this:
Remove the batteries from the remote, press any button on it to clear its existing memory buffer, then re-insert them or replace them with new ones. While unit is on (no DVDs or tapes in it), point the remote at it - press and hold 1 and ENTER/OK buttons together for 10 seconds, then release.
This should (in most cases) restore full remote command operation to your combo unit - if when you press a channel button on it, and the unit's front channel changes, the remote is now functioning as it is meant to.
The good news is this will constitute any workshop repairs or costs (except perhaps new batteries for the remote if required).
Your DVD recorder can be set up to accept remote contol signals on any one of three channels. Remote 1, Remote 2 or Remote 3.
Your remote can be set up to send signals on any of these channels. You need to make sure your recorder and remote are set to the same channel.
Your recorder is telling you that it is set to receive remote control signals on channel 3. This means your remote control is currently set for a different channel.
Assuming that you have a genuine Panasonic remote, do the following,
On your remote press the "Enter" button and hold it down. Then press the "3" button at the same time for two seconds, then release both. This will change your remote so it sends signals on Channel 3 which will match your recorder.
Those clever people at Panasonic realise that you will be delighted with their products and will probably have several of their appliances in use. The different channels avoids switching all your Panasonic gadgets at the same time. Clever huh?
My remote is not working. When I press a button, I get the following message on my unit: U12, U30, SET #, CHK REMOTE #, or RC #. What can I do to fix this?
The message displayed means that the remote control and unit are not communicating and the remote needs to be programmed. To program the remote, press and hold the same number that is displaying on the unit and the [ENTER] or [OK] button for more than 2 seconds. For example, if the unit displays “SET 2”, press and hold  and [ENTER] or [OK] for more than 2 seconds.
The remote control for my DVD recorder has stopped working. Every time I press a button, the display says "CHK REMOTE 1", "RC1" or "SET1". What is wrong?
Your DVD recorder remote control can be programmed (with different codes), so it can be used with multiple Panasonic DVD players. When you press a button and the display shows [CHK REMOTE #] or [RC#] or [SET#] it means that the DVD recorder and the remote control are not set to the same code.To set the remote control code to that of the DVD recorder, press and hold [ENTER] as well as the corresponding code number on the display (1, 2 or 3) at the same time for more than 2 seconds.
Look into your manual that came with your dvd recorder for DMR-E80H, Page 46, Changing the Remote Control Code. My child played with a remote control as well and reconfigured it as well. In the manual, you have explanation how to configure your remote control again to work.
Sounds like you've accidently switched the remote to operate under remote code 2 - to switch it back to operate under remote code 1 you need to hold down the "Enter" button on the remote, and while doing that press the "1" key.