Solid red light after resetup and pressing reset switch no reaction
Hi. I reset my main Deco unit (connected with ethernet cable to Router) and then throught the app I've set it up again and also the 2 other units and all 3 were showing a white light. I then moved the other 2 units to where I want them to be and the main one and one of the other 2 is working fine but the light on the 3rd one is staying solid red. The app is not detecting it and I tried many may times to reset it pressing the reset button for 1 second, 2, 5, 10, 20, 30 seconds but the light just stays red. Unplugged and left unplugged for hours but still the same, blinks yellow, red, green, white then stays yellow for about 10 seconds and goes solid red again.
I also tried connecting an ethernet cable to it from the router (unplugging the current main one). Blinking same colors during startup but then after about 6 seconds on the yellow light, the light goes out and doesn't come back on until I disconnect the power and reconnect with same results. I also tried the reset swith with no light but get no reaction and I also tried connecting straight to my PC with an ethernet cable and typing tplinkdeco.net but get message that site can not be found.
Any advice? Kev