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First post and of course its a problem.
I have a Firebird combi 7 oil fired, in most respects it is working fine, my problem is that the domestic side is feeding hot water to the radiators even when the central heating is switched off, neither pumps are running at the time but the burner is, presumably to top up the heatstore, this makes the first radiator very hot and the others warm, has anybody a clue as to where the fault lies.
 
First post and of course its a problem.
I have a Firebird combi 7 oil fired, in most respects it is working fine, my problem is that the domestic side is feeding hot water to the radiators even when the central heating is switched off, neither pumps are running at the time but the burner is, presumably to top up the heatstore, this makes the first radiator very hot and the others warm, has anybody a clue as to where the fault lies.

Anyone ?
Just a clue please :disappointed: I would be most gratefull
 
Hi
I take its a combi? If it is. The three way motorised valve will be passing. A new one ( body and head) are an easy swap.
 
Thanks, yes it is a combi but no 3 way valve, it uses two pumps instead and neither are running but the rads still get hot.
 
That's a real possibility, I was hoping it was not that because it looks like the boiler will almost need total strip down to get at it. If I leave it till better weather to tackle the problem am I likely to cause more damage ?
 
If its easier to do just fit a non return valve into the return pipe just before it goes back to the boiler.
 
if you have vertical pipework straight out of the boiler that will be the cause of the problem, so a non return valve is the answer - fitted in the correct direction to save totally fubarring your pump on the heating circuit
 
Remember to drain system fully and refill using a suitable inhibitor (I.E. Fernox mb1) or similar as to reduce internal corrosion of heating system and boiler.
 
I always use Fernox, the can seem a lot smaller now is it still the same strength ?
I seem to remember a 5 year G'tee was the norm with an annual test of drawing a sample and immersing a steel nail in it as an anti rust strength test, but I am going back 20+ years ago.
 
First post and of course its a problem.
I have a Firebird combi 7 oil fired, in most respects it is working fine, my problem is that the domestic side is feeding hot water to the radiators even when the central heating is switched off, neither pumps are running at the time but the burner is, presumably to top up the heatstore, this makes the first radiator very hot and the others warm, has anybody a clue as to where the fault lies.
ooh I know this one. My brand new Firebird boiler was doing the same. Turns out there is a NRV and that gets jammed. They sent a man to fix it, with it being less than a week old. Now it's 3 weeks old and that problem is solved and all I now have to do it try to get the water above lukewarm.
I am really angry because I checked online for reviews before I chose this and I'm wondering if Firebird gets their employees to write good ones for otherwise rubbish boilers.
 
I always use Fernox, the can seem a lot smaller now is it still the same strength ?
I seem to remember a 5 year G'tee was the norm with an annual test of drawing a sample and immersing a steel nail in it as an anti rust strength test, but I am going back 20+ years ago.

Went on a vailliant course last month and the bloke showed us the trusted fernox and nail sample, just to purely laugh at because the corrosion was crazy. Youd swear it was in water
 
Went on a vailliant course last month and the bloke showed us the trusted fernox and nail sample, just to purely laugh at because the corrosion was crazy. Youd swear it was in water

Fernox doesn't need to prevent corrosion indefinitely in a small sample of water with the nail a cm or two from the free surface in order to be effective inside a CH system.

That test when performed correctly is to check for the presence of Fernox in a reasonable concentration. It requires two samples: one tap water and one taken from the heating system. Put a test piece comprising a piece of copper pipe with a nail banged through it in each jar. Compare after a week. If there is Fernox in the system the nail will be nice and bright.

If you keep the samples for months both nails will corrode. If you keep meat in a refrigerator for a few months it will go off. One can't conclude the refrigerator doesn't work from that observation.
 
Fernox a few decades ago was brilliant stuff and really prevented corrosion. It had a strong smell and had foaming properties, only present when you drained the system and the water dropping into a gulley would froth.
The new Fernox seems entirely different and I wonder if it is worth using, rather than other brands
 
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