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Water and radiators dont come on at the same time i have to turn the valvue with screwdriver and then water comes on or turn it again then radiatorscome on please help

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I assume this is hotwater heating.  Your problem is air in the line.  You may have something called an airscoop at the boiler...it is attached to a pipe at the top of the boiler and has a radiator vent unit on top.  Purge it and you may fix your issue...or not.
If you don't have one or the problem persists, you'll have to bleed all of the radiators...perhaps several times.  Be sure when you're doing this that you have water in the boiler before and after.  If you fire a dry boiler, this is a problem which will be very expensive.  You should see about 15 PSI or so of pressure indicating on the gauge.  If you see less than 10 or more than 25, you also have a feed valve issue.  These things do get dirty and they do clog.
If your vent valves at the radiators are more than 10 years old, get replacements.  Take a couple of pictures of them and go to the plumbing store.  Turn the water to the boiler off and quickly change each one.  Turn the water back on, bleed again and you will be fine.

Posted on Nov 15, 2008

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There should be a couple of hoses that run into the firewall of your truck to connect to the inlet & outlet of the heater core itself. When the engine is at normal operating temperature (depending on outdoor temperature this could be 5 - 15 min or more at idle - less if being driven), these hoses should be as hot as the radiator hose. If they're not, it would explain why you don't get any heat in the cab. Repair or replace any hose that is pinched, kinked or crushed.

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If still unable to get heat, it may be a result of a clogged hose or heater core, or a stubborn air pocket in the heater core itself or inlet / outlet hose. With an empty bucket or container & cold engine, you could remove one hose and pinch or close both openings. Next, open slowly / briefly see if antifreeze flows FROM the heater core to the end of the hose while directing the flow into the empty bucket / container. Allow the coolant to drain until you're satisfied that any trapped air has been pushed out by coolant from the radiator thru the hoses and heater core. Reconnect hose.

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Did you ever find out what this was as I have the same problem??

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Hello
By your post im guessing you have a 2 story house.
Have a look at the boiler,water pressure guage.Should be between 12 and 15 psi 140 to180.f when running.
If its above or close to 30 psi the relief valve will open to let off the pressure,we do not want this to happen normally.

If you have high water pressure at the boiler you will need to go to the highest radiator or any one on the second floor and open the bleeder.Looks like this

http://www.ourfixerupper.com/wp-content/uploads/2007/11/cast-iron-radiator-02.jpg

Carefully open it slow into a bucket,let air out until you get a steady stream of water.Do this to all of the radiators,idealy using a bleeder key or needle nose pliers.This may take some time.

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Raise the temp of the t stat to start the boiler.6 degrees above whatever the room temp is.
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Hope this is helpfull

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