Hi, I've got a Vaillant eco tec plus 831 and it had the error code F75 Fault: Pump/water shortage. I'd noticed earlier that the pressure bar looked low but not thought much of it until the heating didn't come on and I saw the error code. I thought I knew what to do and turned the 2 taps underneath to let more water in for about 10-15 seconds. Then the system refired and the heating came on. However, I think I may have overdone it as it's flashing 3.7 and I suspect that may be too high. I've tried running a hot tap but that doesn't seem to make a difference. Any tips would be very gratefully received! Thank you ![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)