Hi I am not an expert so bare with me. My Myson Apollo 30 -50 central heating system is boiling. I went into the loft and the water is blowing out of the little black container in the roof. Even if i set the room stat wich is in the hallway to 10 degrees is is still boiling. I have put a new timer on. With the timer switched off my boiler is still going on randomly. My water pump is running non stop. Can somebody help.
More information required but if the boiler supplies the domestic hot water cylinder then the stat on the cylinder may be bringing on the boiler also the boiler stat may be up too high try turning it down.
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There should be a gate valve on the pipe from the central heating to the cylinder, it looks like a tap and is normally beside the cylinder. This is used to regulate the flow of hot water in the heating system through the pipe coil in the cylinder. If this is open too much it will let the central heating pump most of the water through cylinder and won\'t heat the rads properly, if its closed too much it will do the opposite. Ss I said it looks like a tap, so turn it fully clockwise, and then turn it anti clockwise about half a turn. See how this works and adjust it further to compensate. Hope this helps. Some plumbers forget to fit these but its easy to fit one, just cut the pipe carrying the heating through the cylinder and fit a stop cock (TAP)
you should have a programmer that will let you have the hot water and heating on or off . You could have a motor rised valve on the system which controls both . depends on what system you have . Fully pumped of just pumped on the heating side .
first do not call engineer go up in loft if there is a lot of insulation in loft have some boards to lay down in loft you will have two water tanks one large and a much smaller one look inside the smaller one and if the ball valve is stuck in the upright position and no water in tank move ball up and down water should flow wait for tank to fill then bleed radiators with a small key obtainable at most diy stores for this you will need a small towel with key hold towel under valve loosen the screw at top of radiator air will escape then water will escape do this to all radiators repeat this a second time so only water comes out turn on heating system also there is a chance you will have to turn down heating system
In most cases problems with the circulator pump boil down to two problems. The most common is air in the lines causing an air lock. The next problem is that the pump gets stuck and is not running even though itmay be hot and seem to be running. In this cause the pump can sometimes betaken apart, cleaned and it will work, but usually it needs to be replaced.
Here is a tip that I wrote that will explain circulator pump problems in moredetail.
try bleeding the radiators in the order of downstairs first and then the upstairs and try to bleed them in the order they fill, trapped air can take a while to escape, a good sign on a radiator is the bottoms being warm where the tops( where the air is trapped) stays cooler, a sure sign to which radiator needs bleedin, hope this helps, colin
yes it is possible toupgrade the system to a sealed one using a system boiler as you mentioned. the thing to bear in mind is to upgrade the radiator valves to pressure rated ones 10bar.
The probable cause of the over heating is down to the system being sludged up/cold feed blocked, or possible pump circulating problem?
I would recommend the installation of a magna clean filter to help keep the new boiler clear from system debris.I would definately power flush the system, if the system is a twin two port valve system then a automatic bypass should be fitted, all of this done by a corgi registered gas engineer