Im renovating my place and removed some of the radiators to get behind them, I turned the water on and off a couple of times since and when i put the radiators back im getting a red warning light and it says in the manual it could be from a low pressure throughout the system and to check the pressure guage which is for the c/h so i assume my problem lies with the c/h. I have now linked the whole system, bled the highest radiator in the house and it shows 3 bar pressure but red light is still coming up after numerous amounts of turning the system off and on again. After switching it back on it water runs thru the boiler for about 20 seconds then the red light comes back on, and the reset button doesnt do anything...please can u help me..thanks