We have had our Worcester Bosch combi boiler boiler on test for a week with valves turned off for heating to see if the pressure drops with just hot water. There was no significant drop from the 1.4 set by the Bosch engineer last week and we were told to turn the valves back on today and top up pressure however the green light on the stat is still not coming on and we have no heat coming through to the rads. I understand from past thread that we might thus have a leak in a pipe somewhere reducing pressure but would this also make the green light not come on? I dont want to start rerouting pipes, buying sealant etc if it could be a simple wiring problem? Thanks