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Combi Boiler

Postby vbotham » Fri Sep 14, 2007 6:33 pm

[b]Pressure on biler is 3.5 recommended no higher than 2.5. How do you reduce pressure. I know how to increase. Vinny[/b]
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Postby jsk64 » Sat Sep 29, 2007 8:58 am

the easiest way is to drain some water out of the system
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Postby misty » Sat Oct 13, 2007 12:38 pm

[quote="jsk64"]the easiest way is to drain some water out of the system[/quote] i agree but how do you do that
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Postby Ken Woodchef » Tue Oct 16, 2007 6:36 pm

Hi, it may be worth going round the rads and bleeding them, this can sometimes be the cause of pressure build up in the system due to the reaction of the water on the metals in the system, but be aware of how to top up the pressure at the boiler before doing this because if the presure drops below a certain level the boiler may not start up.

Suggest get someone to watch the pressure as you bleed the rads,but don't let it drop below 1 Bar.

Alternatively, find a drain tap on the central heating pipes, usually at a low point in the system and drain some water slowly into pan by turning the small square nut on the valve.

If in doubt, seek help from a plumber.

Hope this helps
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Postby property man » Fri Nov 16, 2007 6:42 am

Use the blow of valve this will drain to the outside to save mess
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Postby TheDoctor5 » Tue Jan 20, 2009 11:07 am

Last year 64% of the questions asked in our forum were answered within our DIY project pages at The project pages are now separated alphabetically and your answers are accompanied by diagrams and the ability to see, and buy, the tools and/or required to complete your project. Use our search box to look for your answer and save a great deal of time and money!
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