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13th June 2006, 11:43 PM
#1
Automated Home Sr Member
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14th June 2006, 07:56 AM
#2
Automated Home Jr Member
Re: Heating Pressure Dropping Slowly
Sorry it’s a sealed system so there is a leak somewhere. It could very yery tiny, almost a weep.
If you keep putting pressure on it by topping it up ... something is going to give.
This happened to us, and the faulty pipe joint was buried in a concrete floor.
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14th June 2006, 02:27 PM
#3
Moderator
Re: Heating Pressure Dropping Slowly
Do you know if there is a pressure relief valve on your system. This is designed to release the pressure in the heating system by letting some of the water out. This could be faulty and maybe leaking a bit. Just a tiny drip every day is enough to drop the pressure over a 4 week period. If the boiler is mounted on a outside wall, then the pipe from the relief valve will go directly outside, have a look on the outside wall and see if there is a wet patch. You may have to check a couple of times.
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14th June 2006, 10:41 PM
#4
Moderator
Re: Heating Pressure Dropping Slowly
If your boiler is the highest point of the system,
then maybe its time to flush the system ,and add some inhibitor.
after a few years the water starts to separate,
the auto air bleed on the boiler will let out the h2 thus dropping the pressure.
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14th June 2006, 11:43 PM
#5
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1st August 2006, 07:25 PM
#6
Automated Home Sr Member
Re: Heating Pressure Dropping Slowly
I'll put in a second vote for it being the pressure relief valve. It only needs to be an occasional drip when the boiler is firing for it to lose pressure like this. trace the overflow pipe and take a look - I've seen a fast drip from this valve drop the pressure in a matter of hours so it would only need to be a slow drip to cause you the problem.
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