hi there, just had my boiler fixed recently, and the plumber told me i need to drain the system as well, i have just done this, has instructed and guess what, thats right it didnt work at all, i have now got no water in any radiators at all, i opened all the bleed valves to check , it seems there could be a air lock somewere , i presume this would be y there is no water going into the system, can any body help, thanks:confused:

Check pressure gauge on boiler-anything? Make sure water supply is turned on. Your pressure-reducing valve may be stuck or in need of adjustment, or the strainer may be clogged. If you have a combination Extrol valve and expansion tank, check the tank pressure with a tire gauge-it may need to be increased slightly to allow water to enter the system. Check these & post back.

Hi mate, the guy just told me to turn boiler off, empty rads, then turn water back on, then it should be OK , it isn't , pressure gauge on zero, it's a ravenheat combi boiler , I know how to turn the pressure up on the boiler , but not down, but as it stands now it won't do anything

Assuming this system is for circulation of hot water (not steam), it would appear that you have a problem with the fresh water supply to the system. Locate the pressure-reducing valve (typically bell-shaped, may have a fast-fill lever) on water supply line. Lift lever (if equipped) & listen for incoming water. Are you certain that the shut-off valve you used is actually opening when operated? Gate-style valves and globe-style valves can fail closed even if they appear to be open, or become clogged with mineral build-up. Try gently tapping on supply valve & reducing valve with a hammer & post back w/results.