Boiler Pressure Issue

cihat

cihat

cihat

Associate
Joined
30 Nov 2023
Posts
8
Location
Turkey
In the attached photo, you can see a view of my boiler and plumbing system.

I've been dealing with an issue of increasing pressure in my boiler for the past few weeks. Normally, when all the valves are in the down position, the pressure increases to around 0.5-0.75 bar every night. I manually reduce the pressure by releasing water from the discharge valve.

Unfortunately, most technicians in Turkey are untrustworthy and charge exorbitant fees. So, I want to gather as much reliable information about my boiler issue before needing their services. That's why I'm turning to this forum for advice.

I've conducted several tests, and when I closed the valve on the right in the photo, I noticed that the pressure didn't increase. In my online research, I read that pressure increase issues could be due to a faulty heat exchanger, valve leakage, or expansion tank problems.

How can I determine the root cause of the problem? If the pressure doesn't increase with this valve closed, could replacing it solve my issue?

I appreciate your assistance and thank you in advance.


IMG-0976.jpg
 
How do you top up the waterpressure is there a filling loop further down or is it internal ?

If external set pressure then disconnect loop leave overnight without heating on and if pressure is the same you've found the problem.
 
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Images aren't showing but I would expect that the top up valve is not sealing properly. Given you are releasing water periodically it must be entering from somewhere and the only place is from the fill loop. As above, disconnect the fill loop and replace the ball valve, which may be weeping slightly.
 
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if the boiler is un-used but the pressure increase then its down to the filling loop bypassing or the hot water heat exchanger bypassing.
 
Last night, I turned off the boiler by switching off the fuse before bed. An hour later, I noticed the pressure had gone up again. So, I closed the valve to prevent further increase, as the pressure was at 1.7 bar then. In the morning, it was nearly 3 bar, which is strange because I had closed the valve.

I've also observed something else. When I manually refill the boiler, using the blue water filling valve (not visible in the photo but marked), and set it to 1.5 bar, it seems to trigger an increase in bar pressure afterwards. I say this because if I manually fill it to 1.5 bar in the morning, then drain it to 1 bar, the pressure doesn’t go up all day while I'm at work (with the water inlet valve closed).

It's like rocket science, for ****'s sake. Being a tenant is a sad reality...
 
cihat said:
Ferroli FEReasy F24
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If you have a leaking pressure valve/filling loop that would increase pressure to the same pressure as the incoming mains.

You may have a faulty pressure sensor.

Once the pressure drops to 1 bar does it go down any further whether it's been on then cooled or left off ?
 
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mickyflinn said:
If you have a leaking pressure valve/filling loop that would increase pressure to the same pressure as the incoming mains.

You may have a faulty pressure sensor.

Once the pressure drops to 1 bar does it go down any further whether it's been on then cooled or left off ?
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The pressure gauge is mechanical.. it won't be faulty if its moving up and down ok..

he has a bypassing filling loop or a bypassing hot water heat exchanger..

he needs to remove the filling loop, cap it off and wait to see if the pressure still goes up.
 
If you see a slow increase in pressure in your combi boiler, even when it's not operating, it can be a sign that the valve in the filling loop, which opens and closes to allow mains pressure water in to fill the boiler, is not able to close off fully, allowing mains pressure water to slowly enter the boiler.
 
radderfire said:
If you see a slow increase in pressure in your combi boiler, even when it's not operating, it can be a sign that the valve in the filling loop, which opens and closes to allow mains pressure water in to fill the boiler, is not able to close off fully, allowing mains pressure water to slowly enter the boiler.
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i guess this is the exact problem. i'm gonna fix it.

thank you guys all your help!
 
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