I had a combi boiler fitted 12 months ago. Hot water is fine.
downstairs radiators are fine but all upstairs are cold. I have turned
of the heating and bled all the radiators, small amount of air
downstairs. Virtually no air came out of the upstairs rads and no water
is coming out. What do I try next?? Will draining the whole system and
It sound as if the system needs balancing, as has been mentioned further
down ( in think there was even a link)... Remember the water will alway tend
to take easiest route. So, the hotter rads have better (more) flow through
them. Restricting the flow to these will encourage more flow (of hot water)
though to the colder rads.
Sorted!!! Eventually. We read through the handbook which seemed
designed for the fitter rather than the layman problem solver, got to
the part that mentions pressure drop and the book says " teller the
customer what to do in the event of a pressure drop". If I was told I
would have written it down and put it with all the other paper work so
I wasn't told. Eventually we worked out that the bit of plastic the
plumber had left was a key and it then took a while to figure out where
to put it.
Radiators off turned key and filled the system. Removed a mass of air
from the upstairs rads and then hey presto I have heat.
Thanks for all who offered help. the pressured had dropped down to
You are saying no water is coming out of the bleed valves on the radiators.
I am no expert but it sounds to me like the system needs
refilling/re-pressurising via the filling loop on the boiler and then bleed
the radiators upstairs. If the air stops coming out before water appears,
you will need to repressurise again and carry on until you have got all the
air out of the system. DON'T Forget to tighten the bleed screw(s) if you
need to refill halfway through! When all the air is out repressurise the
system to the correct bar rating, usually the plumber sets a red pointer on
the dial, but look in your manual if necessary.
If no water's coming out then your system pressure is too low.
Combi boilers are (almost always) pressurised sealed systems. There will
be a "filling loop" which is a pair of taps which allow you to use mains
pressure water to fill the system using the pressure gauge on the boiler
to decide when to stop. There's usually a flexi-hose between the two
Do that and bleed the system again, repressurising again if needed. Then
see what happens.
Roland Butter :- There\'s nothing like a knob of butter.
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