Boiler, Hot Water Problem

[bren_9311]

So I moved into my new flat on Friday and the boiler pressure was at 0.5. Called the engineer and that was fixed, and a new clock was put on it.

Now my problem is, I heard a loud pop from the boiler and went to investigate, the pressure jumped up to over 3 and into the red zone. The boiler had no power as the switch tripped. I reset it and it went back down to 2.5 still in the red zone though, but within normal pressure according to the boiler instructions.

The hot water is set to 60, but it comes out hot and after a couple of minutes goes luke warm and doesn't heat up..

Anyone know what my problem is?

Edit the pressure is currently on 3.

Sorry if all jumbled up tried to explain the best I could.

Thanks Brendan
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[Andy_Pagin]

A modern condensing boiler is in practice a horribly complex analog computer. You really need to get a heating engineer to check it out. There really isn't much you can safely or legally repair yourself since it's a gas appliance.
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[CaNsA]

Drain some of the water out of the heating system until the pressure is 1bar and make sure the fill tap is fully closed.

Whats the make n model of the boiler?

[bren_9311]

[CaNsA]

easiest way to drain water out of a heating system is to use the bleed tap on the top edge of the radiator.

the fill tap on the boiler is highlighted.

https://i.imgur.com/VLNbwCf.png

Central Heating Primary Circuit
Pressures in bar

Safety Discharge 3
Max Operating 2.5
Min Operating 0.5
Recommend Operating 1-2

[bren_9311]

Opened that no change in pressure, There is a smaller tap that when turned the pressure increases I tried the one opposite that one and nothing.
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[CaNsA]

[bren_9311]

[CaNsA]

[CaNsA]

[bren_9311]

[CaNsA]

Depends, some of them have a slit across it where you can use a flat blade screw driver.

do you have a socket set, one of those should fit.

Here's a link to the manual for your boiler.
https://www.mainheating.co.uk/docs/Main_Combi_24_HE_Installation_and_Servicing_Guide_2011.pdf

[metalangel]

[bren_9311]

Heres some picture maybe it'll give a better understanding.

The picture of the pipes, the second one from the right is the water inlet (closed?)

The little one on the left increases the pressure..
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[CaNsA]

Close the lower 2nd black tap from the right then go see if you still get hot water from the sink tap.

stop putting more pressure into the system for the love of god man.

[bren_9311]

[CaNsA]

Jammin.

Turn the tap back to open.

You will need to release pressure out of the heating system.

the pressure has gone above the max limit and might end up pissing water out the safety drain.

[bren_9311]

[quote="CaNsA"]Jammin.



You will need to release pressure out of the heating system.

quote]

?

Since closing and re opening the tap, the pressure has gone back into the green zone just.. Water still not constant though.
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[CaNsA]

constant?

huh?

[bren_9311]

[CaNsA]

look on page 7 of the manual i linked above.

find the drain off point, item 7 on the diagram

drain off some water.

[bren_9311]

[CaNsA]

[bren_9311]

Done, pressure is normal now.

Still the same problem after about 30 seconds becomes tepid.
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[CaNsA]

is the central heating on and the radiators hot?

leave it 10mins then try the hot water again.