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
 
There is actually a blue valve here, but it is not visible in the shade. I fill the water from this part.



IMG-0976.png
 
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...
 
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.
Click to expand...
i guess this is the exact problem. i'm gonna fix it.

thank you guys all your help!
 
Unfortunately, I will have it repaired by a local mechanic. I'm afraid of ruining the whole boiler if I try.
 
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