Boiler Problem

[KBlack]

Hello I hope somebody will be able to help me with my latest problem.

I have an Ideal boiler which would ignite then cut off immediatly - on investigating I found I had a lot of air in the system and that the boiler had a sensor in it which tripped.

I bled all radiators and the reset the sensor. Since then it now fires up, passes the internal checks and all works fine. After a period of time (10 mins or so) there is a whining/howling noise in the boiler and it trips out after a few seconds of this. The boiler then waits a few minutes and refires up again and continues like this.

After a while the boiler stops doing this as it overheats and needs to cool down. Letting it cool down then turning on again repeats this pattern.

Please help me

 

[kevplumb]

jeez i wish i was a flaming mind reader

can't be bothered to find the crystal ball FWIW

 

[KBlack]

I did try to provide as much information as I could, I dont think it warrented that though.

 

[bster]

KBlack -

Give the pros all of the details of your system - boiler, cylinder, controls etc, etc... -there are hundresds of different combinations so they could be guessing all night (well they wont they will just ignore you)

The more informaton then the more chance of a diagnosis!

 

[Trance Nation]

Lookintomyeyesnotaroundmyeyeslookintothemseewhaticanseelookaroundmyeyes.............

What Kev was saying (as a trained psychic/psycho ! i am qualified to answer) is "what boiler do u have" - We have established its made by Ideal but what model is it.

Thanks.

 

[KBlack]

Its a Ideal minimiser SE wall mounted gas fired, fanned flue condensing boiler

The thermostat and control panels are British Gas UP1 and RS1

There is a hotwater cylinder upstairs.

 

[Trance Nation]

Just having a laff with you dude, no offence intended of course !

I assume the water pressure on teh boiler is ok ? 1-1.5 bar

U say you bled sum rads, did u fill up afterwards ?

 

[KBlack]

It does not have a pressure gauge like some systems I have seen where you manually let in water its a system with a header tank in the loft and that fills the system.

I know you are having a laff with me its cool (prob coz boiler dont work!)

 

[Trance Nation]

Ah ! No worries i have just read ur edited post re: the hot water cyl.

Sadly i have not done much work on this particular model but it sounds like an airlock in the pipework or faulty pump. Does the pipework from the boiler get hot when it is on ? If so does the heat appear to go anywhere - eg a radiator ?

 

[KBlack]

Yes the pipework gets hot but alas the radiators do not

 

[Slugbabydotcom]

Is there a manual air vent near your cylinder?
If so have you bled it?
Use a big screwdriver as a listening stick. Can you hear the impeller spinning or is it just a buzz or is it silent?
Is there mains voltage at the pump?
Chuck a towel underneath it to catch the dribble of water. Undo the big screw in the middle and stick a screwdriver in there. Does the shaft rotate?

 

[KBlack]

Is there a manual air vent near your cylinder?
If so have you bled it?

Not that I can see

Use a big screwdriver as a listening stick. Can you hear the impeller spinning or is it just a buzz or is it silent?

I am deaf I am afraid and unable to tell did ask the wife and I got a puzzled look.

Is there mains voltage at the pump?

Yes there is

Chuck a towel underneath it to catch the dribble of water. Undo the big screw in the middle and stick a screwdriver in there. Does the shaft rotate?

Stick my screwdriver where?

Also I am having the same problem as before except after bleeding rads again I now have hot radiators upstairs but downstairs they are cold.

 

[Trance Nation]

Also I am having the same problem as before except after bleeding rads again I now have hot radiators upstairs but downstairs they are cold.

Defo sounds like an airlock problem. U can tell if the pump is running by removing the large screw on the front of it, catching any escaping water with a towel, and stick ur screwdriver into the "hole" where u have removed the large screw from. Ur screwdriver will rattle against the pump motor if it is moving ok.

As i have just mentioned it sounds like an airlock to me. If ur sure the pump is defo running, shut off each rad as they heat properly (eg all over its face, both pipes too). This should force the heat along pipework/to rads that arent heating at present.

Worth a try, good luck !

 

[ChrisR]

Pumps can be spinning away absolutely blocked with crud, so moving no water at all.
Being an Ideal minimiser it probably needs a service. They always need a service... 10 minures isn't bad for one of those....