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Can you get the manual online? You have the Manufacturer info so you probably have the model number too. I found a manual on Manuals.com for my boiler so they may have yours too which will hopefully have some information on filling boiler although I realize each installation is somewhat different but that's why it's difficult to answer you question. Usually there is a manual pressure valve that regulates the water pressure in the boiler which is usually pretty low...like less than 20 lbs. The manual should tell you the pressure as well. But this pressure valve has a flip handle that comes off the cold water line to the boiler to do just what you want to do...refill it with water. When refilling the boiler (if you find the valve, you may have to purge the air out of the lines which there is a whole other process for. But you shouldn't allow cold water into a hot boiler...it could crack it when the cold water hits the hot cast iron. So make sure the boiler is cool when filling it up.
Now go try to find that manual!
You didn't specify what kind of boiler you have. Some low pressure steam boilers have a manual fill valve as well as an automatic float switch valve. Hot water boilers have a pressure reducing valve that constantly monitor the boiler pressure and maintain 12 to 18 PSI for the safety of the boiler. If the boiler runs out of water there is a good chance it will rupture and become unrepairable. If you are saying your boiler won't fill, and its a hot water boiler, the pressure reducing valve is probably blocked with sediment and needs replacement. The valve is in the water line that feeds directly into the boiler return line from city water. Hope this helps.
Its probably time for small claims court and a new company to install good equipment. Have a couple different companies/contractors give an estimate and possibly expert advice/witness you would then be able to use in court so you can get reimbursed from a bad company. Hope it all works out.
Check the pressure reading, should be about 1 bar when system is cold. Various models in the range of 24cdi. If you do not have a manual, go to, http://www.centralheating.co.uk/Boiler-Manuals/worcester-bosch-boiler-manuals/worcester-bosch-discontinued-boiler-manuals. Get the manual for your unit, to wards the end of install manual it has a fault finder, Also has a basic 1 in the user manual. Number of flashes how fast the light flashes which one flashing can all mean different, So get the manual and check, Some parts are easy to fix, as long as you do not touch the gas side the rest is plumbing. Come back if needed.
We have just had our old system boiler replaced with a vaillant ecotec plus 837 and sounds like a similar working operation to ours. At first I was a little concerned,but I was told by our installer that he was told by vaillant that these very latest boilers size the system on start up for about 10 mins, then take temperature to target flow which you set boiler at.
So even by setting target flow temperature very high you still get the initial sizing cycle, which ours was about 30-35c temp.
These boilers seem to run biased for efficiency as after a while they modulate the boiler burner down and the radiators run more on the side of warm than really hot like the old type boilers. You also get better efficiency as at lower temperature the boiler condenses better. You will also find you get a more constant temperature in your home rather than over shoots.
I was concerned at first, shame there was no info/explanation in user manual as people do need to know that this is normal operation.
We are used to ours now, took a month and by the way these boilers can make a creaking noise but was told this normal expansion/ contraction but annoying when sited in bedroom cupboard.
Best of luck!
Do you have a sight glass that shows water level in boiler on this loop? If so is it marked where normal water level is supposed to be? There should be a water line connected to boiler with a valve on it. This will be a manually operated valve unless it has auto fill control. Locate this valve and slowly add water until level in sight glass is back where it should be,then shut valve.While you are doing this the boiler should be at operating temperature because hot water expands and you don't want to overfill. There should be a temperature and pressure relief valve on top of your boiler to prevent unsafe conditions but I wouldn't count on it working properly if it is very old. My main concern is for your safety so if you are unsure of something don't do it. If your boiler has a automatic water make-up on it then you need to have a service tech. find out if it's not working,and repair or replace it. I hope this helps you. Thanks