The Efficient Home Forum

I worked it out - a dual red light is because you have turned off the ability for the TRV to be changed on the TRV

Rob

I have an evohome system set up and working with a number of HR91 thermostats
When I went around checking them yesterday some of them show a solid double red light which stays on for a couple of seconds when I hit the right hand button
I have changed the battery, reset them on the thermostats and ...