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Kevplumb thanks for the answer. It all makes a lot of sense and this is what I thought initially. However when I turn the red knob the brass shaft is turning with it until it clicks and then I can keep turning it until it clicks again. I'm not sure when it clicks is the valve in a close position...

Kevplumb what is the red plastic collar for? I would really appreciate a constructive answer.

Brumlad, Thanks for you constructive answer unlike the useless one above, which is not even worth the effort to type it. The cylindrical thing is an auto air vent but how this once can be the source of the problem? Do you recon that it may be some air stuck in the bypass and I can release it...

unfortunately things are not working fine with my CH problems with air in the system etc. as a result of which I've tried many things and once of them is turning this valve so I don't know what was it's initial position that is why I was looking for some advice.

Hi, I have a sealed CH system and I have a valve which I don't know what its purpose (See pictures below) is. The pipe that feeds in to it is the Primary return of the HW but it also can go below, I guess to the boiler. Could you please advice me what is it for and shall I keep it open or...

I have a Keston boiler with sealed CH which I've recently drained and refill for treatment. After flushing the system, adding the restorer and I also added Fernox leak sealer, I'm experiencing the following problem. When the water is Hot (i.e. boiler working) after the pump starts I can hear the...

Felix that for the advice. Unfortunately I've been bleeding many times but no air comes out of the radiator but it still make noises. Is possible that air is locked at the opposite end of the bleed valve and it cant come out because it is quite wide radiator (~130cm)?

Hi, After I added Fernox Leak Sealer to my sealed CH system and bled the rads and pump multiple times, every time when the pump starts there is a "water running like" noise coming from the pump for few seconds and the it disappears. Any idea how to get rid of it? PS The pressure is set to...

It is set on III for 13 rads but it was on III before when it was not so noisy. I've bled the pump as well when I bled the CH. BTW I've red in some of the previous discussions that if the pump is positioned vertical (like mine) it doesn't have to be bled, but I bled dit anyway. Also i have auto...

I have Keston boiler with pressurized CH system. After I cleaned the CH with Fernox Restorer and flushed it then added Fernox Protector, my pump (Grundfos) seemed to get a bit noisier than before (lauder humming noise). I've bled the system several times and it doesn't seem that there is air in...

Hi I have Keston Boiler with a pressurised central heating system. After i've installed recently 5 TRV my system looses pressure ~0.4 Bar/week and it is obvious that the system is sucking air from somewhere. I think that I have a micro-leak in my system but I can't find it where it is exactly...

OK I guess I have to flush the CH properly then. The problem is that the drain valve is above my boiler, higher than all downstairs rads. What I've done is drain the system trough the drain valve, refill it , switch pump on for few minutes and drain it again. After I've done this for about 6...

Is it possible if I didn't flush properly the Fernox restorer, the small remainder can get into some chemical reaction with the water and/or Fernox protector and generate gas or air?

I've tried to increase the pressure as well as bleeding the rads with one valve open at a time. The air didn't smell nice and also from time to time instead of the normal water flow there was something like a "fizzy water" coming out from the bleed valve (is that air?). It seems to me that my...

ChrisR, I flushed the restorer by refilling the system few times and draining it, but it seemed that I haven't done a great job because now the water in the system is a bit coloured from the restorer.

I have Keston Gas boiler with a pressurized central heating currently set to 1.2 bar. The system is 5 years old and I recently have drained to install 5 Drayton TRV. After running it with Fernox restorer for a week I add Fernox Protector and bled all the rads, pump multiple times (with the pump...