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This - or a very similar problem - is talked about towards the end of another thread here. Please check that and come back if the solution there does not help you.

Hey guys,

I just had a very similar thing happen to my emonPi.  It has been running for a while an then this happened.  Now I'm unable to connect to it via browser or SSH.  I was wondering if you had figured out a cause.  I'll see if I can get access again and report back.

Hi, I had a look at the thread that Robert suggests above even though it refers to the emonSD-20Feb2016 build while my emonPi is with emonSD-17Jun2015. Anyway, in that thread somebody suggests updating emonPi firmware as a solution (Emoncms > Admin > Update emonPi > Update now). However in my case, after updating I still got LCD errors. Then I installed emonPi and it ran smoothly for 22 days, reading the LCD power data from time to time. Today I checked all the LCD data pressing the button several times I got the same problem again. In my case I can log into Emoncms and I can see that the Raspberry is not getting data anymore.

After restarting emonPiLCD service I got LCD showing meaningful data again:

pi@emonpi /var/log/emonpilcd $ sudo service emonPiLCD restart
[ ok ] Stopping system emonPiLCD daemon:.
[ ok ] Starting system emonPiLCD daemon:.

But I still with no data neither in Emoncms nor in the LCD: specifically data was frozen to the last values received. Then I updated emonPi firmware and data was refreshing again.

Hi Matt, 

Sorry to hear your having trouble. It sounds like you may have a hardware issue with the lcd. Please drop shop support an email and we'll arrange a return.

support@openenergymonitor.zendesk.com

Alternatively, if your feeling up to it, you could unscrew the side of the case and check the LCD connections. It could be a loose connection.

Just an idea, could it be a power issue? What 5V DC PSU are you using?