04-16-2012, 01:51 PM
This appears to be the same problem as just reported in http://www.comfortforums.com/forum73/2830.html
Your UCM is the same as Pgordons ie ETH01 is plugged on top of an old UCM05
The J2 shunt must be connected to the \"RS485\"side. It could have fallen off while you were \"tidying up\" I would bet 10 Euros on that!
Your UCM is the same as Pgordons ie ETH01 is plugged on top of an old UCM05
The J2 shunt must be connected to the \"RS485\"side. It could have fallen off while you were \"tidying up\" I would bet 10 Euros on that!

