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Hello all. I recently bought a house and decided that before the winter sets in that I would flush the heating system and refill with new inhibitor etc. I have done this several times before on other houses without any problems. It is a combi system with a hot water tank in the airing...

That's great. Can it be cleaned at all, or is it a straight replacement?

Another problem I have had on the grant combi 90 is this.... When the hot water is on and left on for a while (running a bath, etc) the heating comes on even if it is switched off. And when the heating forst comes on in the morning, the DHW is luke warm at best. What would cause this...

Why would I replace the boiler? What looks like corrosion round the area of the valve is just insulation, it actually looks really bad in the picture doesn't it!!! The auto air vent I have got is very similar to the 7703/4 parts in that link. I seem to recall it has a button on the top which...

OK, it's a combi 90. I have attached a pic of the offending item. It looks like it has corroded through some of the insualtion around the outside of the tank.

hahaha, I will get a picture when I get home.

Where would I get a replacement?

All I know is it's a Grant 90. If it is an auto air vent, the only thing I can think of is they have modified the part so it looks different now. What is in there now is a straight pipe about 2 inches tall, which bolts on to the tank and the other end has a screw on cap and a tyre valve...

No, it's not the expansion tank, as I replaced that last year (was leaking water as the seal inside had split) This is a pipe that is attached to the tank behind the control panel, so when you open the front door, it is top left. Does anyone have a diagram of the boiler, or a list of...

Hi all, Another problem with the boiler. It is leaking from a valve near the top front left, located just behind where the timer is, on the main tank. It has a twist off valve similar to a tyre valve, but it appears to be leaking from the valve itself. The valve is not attached to...

Morning all, the shower was a cold one this morning as there was no hot water!!! It seems that when the heating first comes on, there is no hot water. After the heating has been on for a while and all the rads are hot, there is some hot water. Is this something common? Could it be there...

Yeah, I just wanted to know, there must be a way of curing this prob?! It never used to do it?! We have got guests staying soon and I would like to sort it by then! Cheers

Hi all, I am getting cloudy water, from all taps/showers hot AND cold. If I put it in a glass it clears from the bottom up, so I presume it's loads of air bubbles? Thing is, can I sort this out? I know there is nothing wrong with it, but it looks disgusting especially when you have people...

Just fitted the new parts after doing a flush, Filled with inhibitor, bled system, everything appears to be working and is actually better than before. The rads get roasting now!!! Pressure is 1bar when cold and 1.5 bar when in operation. Just want to say thanks for all your help on this. Lee.

I had that coming I suppose! I just want to be prepared for the job! I am normally quite good at learning new stuff like this, maybe I sound a bit thick this time round?!

So let me get this right, I am screwing the drain cock to the valve where the rad has been removed (does it matter which side I screw it onto). Where does the copper pipe come in? Maybe I need to go on a plumbing course?!

Forgot to ask, when fitting the Auto air valve is there anything I should know? Do I have to open it when filling the system and close once it's filled?

OK, that's great. Think I understand! I have never bought plumbing parts before. What do I need to ask for at the DIY shop then? I have an old bit of hose, how do I attach that to the fitting on the rad? You couldn't send me a link to what it looks like on screwfix or something could you...