combi boiler pressure

[gup77]

My combi boiler pressure has dropped to below 1 so it now takes forever for the hot water to heat up and the central heating seems to be going as well. Can I fix this myself or is it a job for a plumber?

[luckystrike]

On my boiler there is a little black rectangulat 'tap' thing, which if it is turned 90 degrees for a few seconds, and then turned back off, allows more water into the system and increases the pressure.

 

You should be able to see the pressure increasing on the display.

 

Good luck.

[ianess]

I agree with luckystrike about how to repressurise the system but the question remains as to why it should be necessary.

Have you any visible signs of leakage [even a slight weep from a thermostatic valve could end up with a largeish loss of water over time].  It could be evaporating immediately and you wouldn`t even notice.

If you suspect anything sinister it`s probably better to get it checked out by a reputable plumber/heating engineer.  Best of luck.

[Sammy Snake]

My combi had only been fitted about 6 months when all of a sudden, it stopped working.  I did notice that the pressure had dropped below 1, so read the manual, which stated that the boiler would switch itself off if the pressure dropped below a certain level.   I also remembered the bloke who fitted it, saying that the pressure should be between 2 and 3.

 

I was all set to call a plumber out (a great expense, probably) when a girl at work advised me that there should be a 'tap' type knob somewhere in the region of the boiler, and it would need turning on a bit more as the pressure always drops in summer.

 

Sure enough, I  found a tap, turned it just a bit 'cos I didn't know whether it was the right one or not, the pressure rose and the boiler lit itself again.

 

I don't know why this happened, but have had no problems since.

[devonmanuk]

Combi boilers work on a closed circuit system. Usually there is a steel flexible hose attached to the water supply. Attach this hose to the fitting under the boiler that takes the hose connector and turn the valve to allow water from the supply to enter the boiler's system. Watch the pressure guage while doing so and turn the valve (or tap) off when the pressure reaches 2.5 bar.