What does it mean if the pressure is low in my boiler?

Question

Is this linked to more air in the system, and if so, is it cause or effect? Is there anything to be done about it?
Thanks

Answer 1

if the pressure is low in your boiler, it more than likley means that you are loosing water from the heating system. check around the radiator valves for any drips or wetness around the nuts.also check under the boiler and around the pipe connections to the boiler for any signs of leakage.if you do not find anything ,repressurise your boiler via the filling loop to a minimum of 1 bar on the boiler pressure gague {do this when the system is cold}. once you have done this leave the boiler for at least 1 hour and then go back and observe the gague to see if you have lost any pressure.if the gague has dropped you may have a leak where you cannot see it e.g under the floorboards.
there are a few other reasons you could be losing pressure ,but i would reccomend you contact a corgi registered engineer to take a more indepth look at your system and boiler

Answer 2

Low System Pressure Boiler

Answer 3

I assume when you talk about the pressure relief valve you mean the filling loop? It should be under the boiler usually black lever and steel braided pipe - to top up the boiler pressure turn it anticlockwise and stop when you get to 1.2 bar you will hear the water struggling through if you don,t then your mains water pressure is lower than the needed pressure to get into the boiler. Is your cold water from kitchen tap really high pressure if not then a combi should not have been fitted. Try filling the combi at a time when most people are sleeping you then have the best pressure available Remember everytime you top up the combi significantly you will have to bleed the rads to get the air out and then top it up again if the pressure has gone down.

Answer 4

If your pressure is below 1 Bar you will need to top your water up.There will be a filling loop underneath,open this (you will see a valve on it) for about 15 seconds.You must close this valve then or your boiler will flood.Your pressure will then build up to an acceptable level within a minute or so

Answer 5

if it is a sealed system it might have a leak, somewere in the system.Or the pressure release valve may be passing water or expansion vessel needs repressuring. Have a look outside near the boiler there should be a small pipe see if there is any water coming out.

Answer 6

Not 100% sure - but when my presure is low I have to add more water to the system - you had better check with a plumber tobe on safe side though

Answer 7

Firstly you should bleed the radiators like this-
http://www.ultimatehandyman.co.uk/bleeding_a_radiator.htm

Then top up the boiler, if it has an header tank it will top itself up. If not it will require topping up manually-
http://www.ultimatehandyman.co.uk/TOPPING_UP_A_COMBI_BOILER.htm

If the pressure keeps dropping then you have a leak somewhere, possibly one of the radiator valves, so check them first!

Answer 8

Loss of pressure on your boiler could be due to a faulty pressure relief valve. you need to have it checked out.

Answer 9

No its todo with the filling loop. if the plumber done his job correctly in the first place he would have disconnected it so no-one can mess about this the pressure.

Answer 10

means not enough water, it will need to be filled up via the water fill loop to 1 bar. check for leaks as you may have one, should be running at 2 bars whens it running again.

unless your an engineer you'll need to hire someone to do this.