But, as always, the safest and most comprehensive solution often comes from the help of a professional plumber. You can find one in you area by filling out the short contact form here.
The boiler relief valve or the boiler blow off valve is a safety valve that protects your heating system from building up to much pressure and possibly blowing up. It's a very important part of your heating system. Relief valve on boiler not holding? Then, this could be true. It's also possible you'll need a replacement, so try searching this site and others for 'replacing pressure relief valve on boiler'. Sometimes leaking just means it is doing its job, however. There are 5 reasons a relief valve leaks.
The first reason is, it is defective or just old.
The second reason is, the boiler pressure is to high because of a bad expansion tank "See Expansion tank"
The third reason is the pressure is to high because of a bad
fill valve.
The forth reason is, the pressure is to high because of a leaking coil or a leaking indirect hot water maker.
The fifth reason is, the boiler is over heating and making steam.
What should the gauge on my boiler read?