Buderus Pressure

JoeBags

Hi. My GB142 system has low pressure. When it was first installed, the installer showed me how to increase the pressure should I ever need to, but I've forgotten. I've attached a picture. Thanks for any help!

steve_25

Low Pressure

I'm having the same problem. It's not always low but the "H7" or "P13" shows up a lot on the control panel.

JoeBags

Error Code

My understanding is that the H7 is the error code for low pressure. The P is your current pressure. Yours is 13. Mine is 3 - which is so low the system won't even come on.

JStar

H7

You have a leak. You should never have to fill the system after the installation.

JoeBags

Done

CMadatMe

Never, Never

Just add water to the system without determining how it found its way out of the system. It did not just disappear.

Paul48

Hmmm

Signs of leaks in the photo.

Mplsavant

There should be a spiket

fill valve on your line. On my GB142 I have a washer hose attached to one spiket with new water connected to the other spiket on the line running into the boiler.....this is how I fill mine whenever I need to....also, I've had mine for 7 years, it will need an occasional fill....

JoeBags

Mplsavant Correct

Yes. Plumber said my system has an auto-fill valve that got stuck, so it was just a matter of a manual flick of the valve to over-ride. No, no leaks. Heating system not even on, just hot water. Plumber tested for leaks - none. Touch of condensation here and there, but no leaks.



Plumber said it is completely normal for any condensing boiler system to very gradually lose pressure over time if it has no auto-fill. No way of knowing, but could have been gradually over 2 years in my case.

CMadatMe

Scratch, Scratch

If the system is a closed system which this is, where does the water go? Does is evaporate into thin air?

JStar

Ugh!

That is bad information. How did he test for leaks?

JoeBags

Reply to JStar "Ugh!"

Here's a quote from the Buderus website:



The pressure loss in a heating system is caused by

air bubbles escaping via fittings and (automatic) air

vents. The oxygen contained in the fresh heating

water will also escape from the heating water after

some time and cause a pressure loss.

Topping up once a year is normal. If it is necessary

to top up more frequently, there might be a leak in

the system or a defective expansion vessel. This

must be remedied as soon as possible.

JStar

Pressure

That makes sense...if you have a leak every year.



When you install a boiler, bleed the air, and heat the water, you'll release air from the system one time. After that, how does new water enter the system? It shouldn't, unless there is a leak.

Zman

The answer to the question...

Somewhere in your system you have fill valve/prv and a back flow preventer. It usually connects between the expansion tank and air eliminator. There is a lever that will allow you to manually add water to your system. If adding water to your system becomes a regular event, you have a leak that should be addressed. Adding a gallon or so a year is not such a big deal. Some mod/cons, especially Buderus, leak a little. I would not "throw the baby out with the bathwater". Just add some water and keep an eye on it.

Carl