Hello everybody 'Lurgs' here welcome to my channel and today how to top up the pressure on your combi
boiler now if your heating is not working properly it could be because the pressure has dropped, the
pressure can drop for a number of reasons if you haven't used your heating for a while maybe over
the summer then the pressure can slowly drop or, which is a worst case scenario you have a small
leak somewhere which could be on pipework or maybe on a radiator valve, do remember that this is a
gas appliance but this is a very simple procedure but if you're not comfortable doing it then make
sure you get a professional in. Now ideally a combi boiler pressure should be at 1.5 bar
as you can see with this particular model it is very low indeed so we're just going to top up the
system luckily on this one we've got an analogue pressure gauge I really don't like the digital
ones because they're so much harder to read, to top up the pressure we need to get underneath
the combi boiler this one's got a slight bit of boxing in so I'm just going to remove that first
and what you should have underneath your combi boiler is you've got this filling loop this is
where you top up more water into the system to increase the pressure and on each side of this
filling loop you should have two taps and we'll be using these taps to top up the water pressure
these plastic lever taps do get brittle over time and you may find that they actually snap
off now what you can do is you can remove these taps and replace them just by undoing this screw
here but in the meantime if you just take off the plastic lever you should be able to get a pair of
pliers on the nut underneath and just turn it like that but these taps are in good condition
so let's go ahead. The first thing I'll do is open the tap on the left hand side I'm opening this
fully by turning it 90 degrees this allows mains cold water into this filling loop but this isn't
going into the combi boiler just yet because then we need to open the one on the right hand side,
now if you gently turn the tap on the right hand side but don't open it up fully
just open it up very gently and if you're really quiet you should be able to hear the water start
to fill up into the system as you're doing that and you can hear the water topping up the system
the pressure gauge should start moving upwards, if your pressure gauge is working correctly it should
start moving up and as soon as it reaches 1.5 you can close both those taps down, the pressure
gauge on this particular combi boiler is not very accurate and it takes a while to actually move
so I'm just going to shut this right hand tap down now and then I'm gonna let any excess air
out of the system and we do this by finding the radiator at the highest point in the house
and I've got this radiator bleed valve key here so I'm just gonna go upstairs
in this house and locate the highest radiator because air will always find its way to the top
make sure you've got a tissue ready or a rag
and what we'll be doing now is gently unscrewing this nut here which releases any air outside of
that hole on the outside there, now don't unscrew this all the way you don't want
that nut to come out otherwise you're going to be getting water spraying all over the place
so again just turn it very gently anti-clockwise and you'll hear some air start hissing out
there we go as soon as the water starts spurting out you can close it down
then just mop up that excess water with a tissue now let's go back down to the combi boiler and I'm
just going to put a little bit more pressure in it by turning the right hand tap slightly open again
as you're doing this you should see the pressure gauge start rising
and you want to get it to 1.5 bar, when it gets to 1.5 bar make sure you close down both
taps and that's really important because you don't want to over pressurise the system,
as I mentioned earlier this pressure gauge is slightly temperamental, I'm just going to give
it a tap here and I'm just going to do a bit of a time lapse because this one is taking quite a
while to top up the pressure and that is why you don't go mad when you're filling it up with water
and this is slowly repressurising until we get to 1.5 bar which is absolutely perfect and then your
heating system should all be working properly, if you do accidentally over pressurise the
system over 3.0 bar there should be a safety release valve built into the combi boiler,
if not you can release some pressure from the system and you do that by opening the bleed valve
on that top radiator and just letting some water squirt out into a cup or a rag and that should
bring the pressure down in the system, and I'll tell you what that definitely definitely
deserves a lovely cup of tea! If you found that video useful please subscribe by pressing this
button down here so you don't miss more videos on how to save you time and money there's also some
other videos around the edges of the screen here if any of those are useful to you then you can
select those now thank you for visiting my channel everyone I really really appreciate it. 'Lurgs'