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Low pressure lights on potterton puma 80e?

Last night one of my radiators fell from the wall and bent/broke the "IN" pipe. Lots of water came out of it, but as the pressure went down it stopped leaking. I stupidly left the boiler ON overnight and late this morning it shut down by itself turning the low pressure lights ON.

I decided to get rid of this radiator so i went to a plumbing store and bought a pipe cutter and a connecting hose. Then i cut down the pipes both "inflow" and "outflow" and connected them with the hose at the spot where they were the closest to each other.

Then i went to the boiler and turned the water valve ON untill the pressure went up to 1.5 and i shut the valve. As i turn the boiler back ON, the low pressure lights are still ON, they don't go OFF. I tried turning the mains OFF and ON, reseting the boiler...

The pressure hasn't gone down, it's still in the same place so i assume there's no leaking. but the lights won't come OFF. Would they be turning OFF imediately after the pressure is back on or the system needs time?

i would like to hear some ideas before having to contact assistance. also to know what i might be dealing with.
Thanks!
Pedro ximenez, January 2010
the low water pressure switch is either blocked (sludge) airlocked or faulty. either replace it or unblock it.

darren, January 2010
link Click here to see other fixes for Potterton.